RINGER CORP /MN/
SC 13G/A, 1998-02-04
AGRICULTURAL CHEMICALS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                              (Amendment No. _2_)*


                               Ringer Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    766907109
     -----------------------------------------------------------------------
                                 (CUSIP Number)




*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).



                        (Continued on following page(s))


                                Page 1 of 7 Pages


<PAGE>


- --------------------------                   -----------------------------------
CUSIP No.   766907109                         Page    2      of       7    Pages
          ----------------                         ---------    ----------      

- ------------- ------------------------------------------------------------------
1             NAME OF REPORTING PERSON
              S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
              Cherry Tree Ventures III, a limited partnership
              FIN:  41-1585020
- ------------- ------------------------------------------------------------------
2             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [X]
                                                                       (b) [ ]

- ------------- ------------------------------------------------------------------
3             SEC USE ONLY

- ------------- ------------------------------------------------------------------
4             CITIZENSHIP OR PLACE OF ORGANIZATION
              Minnesota
- ------------------------- --------- --------------------------------------------
       NUMBER OF          5         SOLE VOTING POWER
         SHARES                     648,163
      BENEFICIALLY
        OWNED BY
          EACH
       REPORTING
         PERSON
          WITH
                          --------- --------------------------------------------
                          6         SHARED VOTING POWER
                                    0
                          --------- --------------------------------------------
                          7         SOLE DISPOSITIVE POWER
                                    648,163
                          --------- --------------------------------------------
                          8         SHARED DISPOSITIVE POWER
                                    0
- ------------- ------------------------------------------------------------------
9             AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
              648,163
- ------------- ------------------------------------------------------------------
10            CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN 
              SHARES*                                                    [  ]

- ------------- ------------------------------------------------------------------
11            PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
              4.04%
- ------------- ------------------------------------------------------------------
12            TYPE OF REPORTING PERSON*
              PN
- ------------- ------------------------------------------------------------------


<PAGE>



- -----------------------------                -----------------------------------
CUSIP No.    766907109                        Page   3      of      7     Pages
          -------------------                    ----------    ----------      

- ------------- ------------------------------------------------------------------
1             NAME OF REPORTING PERSON
              S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
              Gordon F. Stofer
- ------------- ------------------------------------------------------------------
2             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*       (a) [X]
                                                                      (b) [  ]

- ------------- ------------------------------------------------------------------
3             SEC USE ONLY

- ------------- ------------------------------------------------------------------
4             CITIZENSHIP OR PLACE OF ORGANIZATION
              Minnesota
- ------------------------- --------- --------------------------------------------
       NUMBER OF          5         SOLE VOTING POWER
         SHARES                     12,648
      BENEFICIALLY
        OWNED BY
          EACH
       REPORTING
         PERSON
          WITH
                          --------- --------------------------------------------
                          6         SHARED VOTING POWER
                                    648,163
                          --------- --------------------------------------------
                          7         SOLE DISPOSITIVE POWER
                                    32,648 (inclds 20,000 shrs obtainable upon 
                                    exer. of options/warrants)
                          --------- --------------------------------------------
                          8         SHARED DISPOSITIVE POWER
                                    648,163
- ------------- ------------------------------------------------------------------
9             AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY EACH  REPORTING  PERSON
              680,811 (inclds 20,000 shrs obtainable upon exercise of options or
              warrants)
- ------------- ------------------------------------------------------------------
10            CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN 
              SHARES*                                             [   ]

- ------------- ------------------------------------------------------------------
11            PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
              4.24%
- ------------- ------------------------------------------------------------------
12            TYPE OF REPORTING PERSON*
              IN
- ------------- ------------------------------------------------------------------

<PAGE>

- -----------------------------           ----------------------------------------
CUSIP No.    766907109                      Page   4        of      7     Pages
          -------------------                   ----------    ----------      

- ------------- ------------------------------------------------------------------
1             NAME OF REPORTING PERSON
              S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
              Tony J. Christianson
- ------------- ------------------------------------------------------------------
2             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a) [X]
                                                                     (b) [ ]

- ------------- ------------------------------------------------------------------
3             SEC USE ONLY

- ------------- ------------------------------------------------------------------
4             CITIZENSHIP OR PLACE OF ORGANIZATION
              Minnesota
- ------------------------- --------- --------------------------------------------
       NUMBER OF          5         SOLE VOTING POWER
         SHARES                     0
      BENEFICIALLY
        OWNED BY
          EACH
       REPORTING
         PERSON
          WITH
                          --------- --------------------------------------------
                          6         SHARED VOTING POWER
                                    648,163
                          --------- --------------------------------------------
                          7         SOLE DISPOSITIVE POWER
                                    0
                          --------- --------------------------------------------
                          8         SHARED DISPOSITIVE POWER
                                    648,163
- ------------- ------------------------------------------------------------------
9             AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
              648,163
- ------------- ------------------------------------------------------------------
10            CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN 
              SHARES*                                                  [  ]

- ------------- ------------------------------------------------------------------
11            PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
              4.04%
- ------------- ------------------------------------------------------------------
12            TYPE OF REPORTING PERSON*
              IN
- ------------- ------------------------------------------------------------------

<PAGE>

                                                                 Page 5 of 7

Item 1(a)         Name of Issuer

                  Ringer Corporation

Item 1(b)         Address of Issuer's Principal Executive Offices:

                  9555 James Avenue South
                  Bloomington, MN 55431

Item 2(a)         Name of Person Filing:

                  This statement is filed on behalf of Cherry Tree Ventures III,
                  Limited  Partnerships  and on behalf of Gordon F.  Stofer  and
                  Tony J.  Christianson  who are  Managing  General  Partners of
                  Cherry Tree Ventures III, Limited Partnerships.

Item 2(b)         Address of Principal Business Office or, if none, Residence:

                  Centennial Lakes Office Park
                  7601 France Avenue S., Suite 225
                  Minneapolis, MN 55435

                  Each of Gordon F. Stofer and Tony J. Christianson has the 
                  above address.

Item 2(c)         Citizenship: Partnerships are organized in Minnesota.

                  Each of Gordon F. Stofer and Tony J. Christianson is a 
                  citizen of the United States.

Item 2(d)         Title of Class of Securities:

                  common stock

Items 2(e)        CUSIP Number:

                  766907109

Item 3            If this Statement is Filed Pursuant to Rules 13d-1(b), or 
                  13d-2(d), Check Whether the Person Filing is a:
                  
                  Not Applicable.



<PAGE>


                                                                  Page 6 of 7

Item 4            Ownership:

                  (a)      Amount Beneficially Owned:
                           See pages 2, 3, 4 & 5 - Item 9

                           Mr. Stofer and Mr.  Christianson  are members of this
                           group because of their positions as Managing  General
                           Partners  of Cherry  Tree  Ventures  III;  voting and
                           control  is based on their role as  Managing  General
                           Partners  of CTV III  and  they  disclaim  beneficial
                           ownership of those shares.

                  (b)      Percent of Class:

                           See pages 2, 3, 4 & 5 - Item 11

                  (c)      Number of shares as to which such person has:

                           (i) sole power to vote or to direct the vote:

                                    see pages 2, 3, 4 & 5 Items 5-8

                           (ii) shared power to vote or to direct the vote:

                                    see pages 2, 3, 4 & 5 Items 5-8

                           (iii) sole power to dispose or to direct the 
                                 disposition of:

                                    see pages 2, 3, 4 & 5  Items 5-8

                           (iv) shared power to dispose or to direct the 
                                disposition of:

                                    see pages 2, 3, 4 & 5  Items 5-8

Item 5            Ownership of Five Percent or Less of a Class:
                  
                  Cherry Tree Ventures III ceases to be the beneficial  owner of
                  more than 5% of the common stock outstanding.

Item 6            Ownership of More than Five Percent on Behalf of Another 
                  Person:
                  
                  Not Applicable.

Item 7            Identification and Classificaiton of the Subsidiary Which 
                  Acquired the Security Being Reported on by the Parent Holding
                  Company:

                  Not Applicable.

<PAGE>



                                                               Page 7 of 7


Item 8            Identification and Classification of Members of the Group:

                  The Group is Cherry Tree Ventures III.  Mr. Stofer and Mr.
                  Christianson are members of this group because of their 
                  positions as Managing General Partners of CTV III; voting and
                  control is based on their role as Managing General Partners
                  of CTV III and they disclaim beneficial ownership of those 
                  shares.

Item 9            Notice of Dissolution of Group:
                  
                  Not applicable.

Item 10           Certification:

                  Not Applicable.




                                    SIGNATURE


                    After reasonable inquiry and to the best of my knowledge and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.


Dated: January 23, 1998                         CHERRY TREE VENTURES III
                                                LIMITED PARTNERSHIP


By   /s/ Tony J. Christianson                   By /s/ Tony J. Christianson
     Tony J. Christianson                              Tony J. Christianson
     Individual                                        Managing General Partner



By   /s/ Gordon F. Stofer                       By /s/ Gordon F. Stofer
     Gordon F. Stofer                                  Gordon F. Stofer
     Individual                                        Managing General Partner






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