<PAGE>
FORM 4
U.S. SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP
___ Check if no longer
subject to Section 16.
Form 4 or Form 5 obliga-
tions may continue. See
Instructions 1(b).
Filed pursuant to Section 16(a) of the Securities
Exchange Act of 1934, Section 17(a) of the
Public Utility Holding Company Act of 1935 or
Section 30(f) of the Investment Company Act of 1940
1. Name and Address of Reporting Person
Jeffrey H. Duncan
2353 Pennington Road
Trenton, NJ 08638-1113
2. Issuer Name and Ticker or Trading Symbol
DTM - AMEX
3. IRS or Social Security Number of Reporting Person
(Voluntary)
Not Furnished
4. Statement for Month/Year
June 1996
5. If Amendment, Date of Original (Month/Year)
6. Relationship of Reporting Person to Issuer
(Check all applicable)
[ ] Director [ ] 10% Owner
[X] Officer (give title [ ] Other (Specify below)
below)
Vice President, Manufacturing and Engineering
_____________________________________________
<TABLE>
Table I - Non-Derivative Securities Acquired, disposed of, or Beneficially Owned
5.
3. 4. Amount of
Trans- Securities Acquired Securities 6.
action (A) or Disposed of Benefi- Ownership 7.
Code (D) cially Form: Nature of
2. ___________________ Owned Direct(D) Indirect
1. Transaction __________ (A) or at End or Beneficial
Title of Security Date Code V Amount (D) Price of Month Indirect(I) Ownership
_________________ ___________ ____ ___ ______ _____ _____ ________ ___________ _________
<S> <C> <S> <C> <S>
Common Stock 6/12/96 M 6,000 A 3.57 D
$1.00 par value
6/12/96 S 3,200 D 5.75
6/12/96 S 700 D 5.82
2,100 D
</TABLE>
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<TABLE>
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
9.
Number
of
6. 7. Deriv- 10.
5. Date Exer- Title and ative Owner-
2. Number of cisable & Amount of Secur- ship 11.
Conver- Derivative Expiration Underlying ities Form Nature
sion or 4. Securities Date Securities 8. Benefi- of De- of In-
Exercise Trans- Acquired _____________ _____________ Price cially rivative direct
Price of 3. action (A) or Amount of Owned Security: Bene-
1. Deriv- Trans- Code Disposed Date Expir- or Deriv- at End Direct(D) ficial
Title of ative action _______ of (D) exer- ation No. of ative of or In- Own-
Derivative Security Security Date Code V (A) (D) cisable Date Title Shares Security Month direct(I) ership
___________________ ________ ___ ____ _ ___ ___ _______ ____ _____ ______ ________ _____ _________ ______
<S> <C> <C> <S>
Incentive Stock
Option 3.57 6/12/96 M -- 6,000 -- 9/18 Common 6,000 ** -- --
/02 Stock
Incentive Stock
Option 7.18 * 9/11 Common 50,000 ** 50,000 D
/02 Stock
Explanation of Responses:
* 20% became first exercisable on 9/11/93 and 20% more on each anniversary of that date.
** Granted Pursuant to Incentive Stock Option Plans.
JEFFREY H. DUNCAN July 9, 1996
__________________________ ________________
Jeffrey H. Duncan
Signature of Reporting Date
Person
</TABLE>
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