OXBORO MEDICAL INTERNATIONAL INC
SC 13D/A, 1999-12-14
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 5)*

                       Oxboro Medical International, Inc..
                       -----------------------------------
                                (Name of Issuer)

                          Common Stock, $0.01 Par Value
                         -------------------------------
                         (Title of Class of Securities)

                                   691384 20 0
                                   -----------
                                 (CUSIP Number)

                             Girard P. Miller, Esq.
                           Lindquist & Vennum P.L.L.P.
                                 4200 IDS Center
                             80 South Eighth Street
                          Minneapolis, Minnesota 55402
                            Telephone: (612) 371-2467
                            -------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                November 30, 1999
                                -----------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of Sections 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check
the following box. / /

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to whom copies are to be sent.

*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 in 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 5 Pages

<PAGE>

CUSIP No.     691384 20 0
- ------------------------------------
    1      NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (entities only)

           CMM Properties, LLC   c/o Gary W. Copperud
           (FEIN Not required)
- ---------  ---------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
           (See Instructions)                                        (a) / /
                                                                     (b) /X/
- ---------  ---------------------------------------------------------------------
    3      SEC USE ONLY
- ---------  ---------------------------------------------------------------------
    4      SOURCE OF FUNDS (See instructions)       00 (Cash Reserves)
- ---------  ---------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGARL PROCEEDINGS IS REQUIRED
           PURSUANT TO ITEMS 2(d) OR 2(e)                                / /
- ---------  ---------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           CMM Properties, LLC is a Limited Liability Company organized under
           the laws of the State of Colorado
- ------------------------------  ------------------------------------------------
                          7     SOLE VOTING POWER

                                                450,346
       NUMBER OF      --------  ------------------------------------------------
        SHARES            8     SHARED VOTING POWER
    BENEFICIALLY
       OWNED BY                                   -0-
        EACH          --------  ------------------------------------------------
      REPORTING           9     SOLE DISPOSITIVE POWER
       PERSON
         WITH                                   450,346
                      --------  ------------------------------------------------
                         10     SHARED DISPOSITIVE POWER

                                                    -0-
- ------------------------------  ------------------------------------------------
   11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                  450,346
- ---------  ---------------------------------------------------------------------
   12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
           SHARES (See instructions)                                     /X/
- ---------  ---------------------------------------------------------------------
   13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
           According to the transfer agent for the Issuer, there were 1,340,336
           shares of Common Stock outstanding at December 3, 1999. Assuming this
           number of shares outstanding as of the date of the events which
           require the filing of this Amendment, the amount at Line 11 above
           represents 31.9% of the Issuer's outstanding shares. The amount on
           Line 11 includes recent purchases of 140,462 shares of Common Stock
           and 70,231 warrants, each for purchase of one share of Common Stock,
           on an as-if-converted basis.
- ---------  ---------------------------------------------------------------------
   14      TYPE OF REPORTING PERSON (See instructions)

                  00 (Limited Liability Company)
- ---------  ---------------------------------------------------------------------


                               Page 2 of 5 Pages

<PAGE>

CUSIP No. 691384 20 0

Item 1.    SECURITY AND ISSUER.

           (a)      Title of Class of Securities: Common Stock, $.01 par value
                    (the "Common Stock") and one-year Warrants immediately
                    exercisable for purchase of Common Stock (the "Warrants")

           (b)      Name of Issuer: Oxboro Medical International, Inc.

           (c)      Address of Issuer's Principal Executive Offices: 13828
                    Lincoln Street, N.E., Ham Lake, MN 55304

Item 2.    IDENTITY AND BACKGROUND.

           (a)      Name of Person Filing:  CMM Properties, LLC
                                            (the "Reporting Person")
                                            c/o Gary W. Copperud

           (b)      Business Address: c/o Peak to Peak Financial, 1730 South
                    College Avenue, Box 20, Fort Collins, CO 80525

           (c)      Principal Occupation or Employment: Investments

           (d)      Conviction in a criminal proceeding during the last five
                    years: No

           (e)      Subject, during the last five years, to a judgment, decree
                    or final order enjoining securities laws violations: No

           (f)      Citizenship: CMM Properties, LLC is a Colorado Limited
                    Liability Company.

Item 3.    SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

           Cash reserves.

Item 4.    PURPOSE OF TRANSACTION.

           As reported in Item 5(c) below, the Reporting Person acquired an
           aggregate 140,462 shares of Common Stock and 70,231 Warrants for
           purchase of Common Stock of the Issuer as of November 30, 1999. The
           acquisitions were effected by the exercise of an oversubscription
           privilege and rights to purchase to which the Reporting Person was
           entitled pursuant to a Rights Offering and Oversubscription Privilege
           described in the Issuer's registration statement on Form S-3 (the
           "Rights Offering"). The Over- subscription Privilege entitled the
           Reporting Person to exercise one or more rights, each for purchase of
           two shares of Common Stock and a Warrant for purchase of one share of
           Common Stock at a purchase price of $2.50. The Rights Offering became
           effective on September 1, 1999 and concluded on November 30, 1999.
           The acquisitions were made by the Reporting Person for investment
           purposes.


                                Page 3 of 5 Pages

<PAGE>

           (a)      On July 22, 1999, as described in the Issuer's registration
                    statement on Form S-3, the Reporting Person agreed to
                    exercise purchase rights in the Issuer's Rights Offering, to
                    the extent necessary to ensure the Issuer satisfied the net
                    tangible asset requirement to continue to be listed on the
                    Nasdaq Smallcap Market.

Item 5.    INTEREST IN SECURITIES OF ISSUER

           (a)      Number and Percentage of Class beneficially owned:

                    Pursuant to the Rights Offering effected by the Issuer, the
                    Reporting Person purchased an aggregate 140,462 shares of
                    Common Stock and 70,231 Warrants for purchase of Common
                    Stock as of November 30, 1999. The 210,693 securities may be
                    deemed beneficially owned within the meaning of Rule 13d-3
                    of the Securities Exchange Act of 1934 by the Reporting
                    Person. As a result of the November acquisitions, the
                    Reporting Person holds an aggregate 450,346 securities of
                    the Issuer, which represents 31.9% of the total 1,340,336
                    shares of the Issuer reported by the Issuer's transfer agent
                    as outstanding at December 3, 1999.

           (b)      For information on voting and dispositive power with respect
                    to the above listed shares, see Items 5-8 of the cover page.

           (c)      Recent Transactions in Securities of the Issuer:

                    The Reporting Person purchased shares of Common Stock and
                    Warrants of the Issuer as set forth below, as of November
                    30, 1999, and made such transactions pursuant to the
                    Oversubscription Privilege of the Rights Offering effected
                    by the Issuer. Pursuant to the terms of the Rights Offering
                    and for each share held at August 20, 1999, the Reporting
                    Person was entitled to purchase two shares of Common Stock
                    and one immediately exercisable Warrant for purchase of one
                    share of Common Stock, at a purchase price of $2.50. During
                    the Oversubscription phase of the Rights Offering from
                    November 1 to November 30, 1999, the Reporting Person was
                    entitled to the same purchase rights at $2.50 per right, to
                    the extent shares of Common Stock and Warrants remained
                    available for purchase:

<TABLE>
<CAPTION>
                                                                                              Total
                    No. of Shares                    No. of Warrants                      Purchase Price
                    -------------                    ---------------                      --------------
                    <S>                              <C>                                  <C>
                      140,462                            70,231                            $175,577.50
</TABLE>

           (d)        Ability to Direct the Receipt of Dividends or the Proceeds
                      of Sale of Securities:

                      Not applicable.

           (e)        Last Date on Which Reporting Person Ceased to be a 5%
                      Holder:

                      Not applicable.


                                Page 4 of 5 Pages

<PAGE>

Item 6.    CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
           TO SECURITIES OF THE ISSUER.

           There are no contracts, arrangements, understandings or relationships
           (legal or otherwise) among the persons named in Item 2 and between
           such persons and any person with respect to any securities of the
           Issuer, except that as described in the Issuer's Registration
           Statement on Form S-3, the Reporting Person has agreed to exercise
           purchase rights in the Issuer's Rights Offering, to the extent
           necessary to ensure that the Issuer satisfies the net tangible asset
           requirement to continue to be listed on the Nasdaq Smallcap Market.
           In addition, the Reporting Person has an informal, unwritten,
           non-binding understanding with Kenneth Brimmer, (who is mentioned in
           Item 5 above and who also is filing a Schedule 13(d)). Such
           understanding, to date, is to the effect that each will try (but not
           necessarily beforehand) to keep the other informed of any significant
           purchases or sales which such person makes, and that each will share,
           with the other, information concerning the Issuer, and requests for
           information addresses to the Issuer, which might affect the valuation
           of their respective investments.

Item 7.    MATERIAL TO BE FILED AS EXHIBITS.

           (a)        Registration Statement on Form S-3 as amended of Oxboro
                      Medical International, Inc. filed on July 22, 1999 is
                      incorporated by reference herein.

                                    SIGNATURE

           After reasonable inquiry and to the best of its knowledge and belief,
the undersigned certifies that the information set forth in this statement is
true, complete and correct.

Dated:   December 11, 1999.

                                        CMM PROPERTIES, LLC

                                        By: /s/Gary W. Copperud
                                           -----------------------------------
                                          Its:      Manager
                                              --------------------------------


                                Page 5 of 5 Pages


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