USD297437SExpiredUtility

Mathematics teaching aid

34
Assignee: MORTENSEN EDUCATIONAL PRODUCTS INCPriority: Aug 8, 1985Filed: Aug 8, 1985Granted: Aug 30, 1988
Est. expiryAug 8, 2005(expired)· nominal 20-yr term from priority
Inventors:Vernon J. Mortensen
34
PatentIndex Score
3
Cited by
2
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for mathematics teaching aid, as shown and described.

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