USD276733SExpiredUtility

Teaching machine

35
Assignee: NORTH AMERICAN FOREIGN TRADING CORPPriority: Jan 13, 1981Filed: Jan 13, 1981Granted: Dec 11, 1984
Est. expiryJan 13, 2001(expired)· nominal 20-yr term from priority
Inventors:Dietmar NagelAndrew LowingerPeter Roegner
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PatentIndex Score
2
Cited by
5
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a teaching machine, substantially as shown and described.

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