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Patent
   D252033
Priority
Jun 17 1977
Filed
Jun 17 1977
Issued
Jun 05 1979
Expiry
Jun 05 1993
Inventors
Restaino, …
Assg.orig
Assg.curr
Entity
unknown
Referenced by
2
References
5
Maint.:
n/a
The ornamental design for a math teaching board, as shown and described.

FIG. 1 is a perspective view of a math teaching board showing my new design; and

FIG. 2 is a sectional view thereof, taken on line 2--2, FIG. 1.
INVENTORS:

Restaino, Lawrence T.

THIS PATENT IS REFERENCED BY THESE PATENTS:
Patent Priority Assignee Title
7645139, May 01 2006 Math teaching system
D752684, Sep 03 2014 Didax, Incorporated Base ten place value frame
THIS PATENT REFERENCES THESE PATENTS:
Patent Priority Assignee Title
1649578,
2494469,
2645041,
3171217,
687288,
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