USD338929SExpiredUtility

Mathematical teaching block

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Assignee: E J ARNOLD & SON LTDPriority: Dec 18, 1989Filed: Jun 15, 1990Granted: Aug 31, 1993
Est. expiryDec 18, 2009(expired)· nominal 20-yr term from priority
Inventors:Robert J. Stone
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PatentIndex Score
3
Cited by
7
References
1
Claims

Claims

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

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