Math teaching board
Description
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.
Referenced Cited
U.S. Patent Documents
| 687288 | November 1901 | Thompson |
| 1649578 | November 1927 | Deming |
| 2494469 | January 1950 | Booth |
| 2645041 | July 1953 | Merrill |
| 3171217 | March 1965 | Birdsall |
Patent History
Patent number: D252033
Type: Grant
Filed: Jun 17, 1977
Date of Patent: Jun 5, 1979
Inventor: Lawrence T. Restaino (Canton, OH)
Primary Examiner: Melvin B. Feifer
Attorney: Joseph Frease
Application Number: 5/807,593
Type: Grant
Filed: Jun 17, 1977
Date of Patent: Jun 5, 1979
Inventor: Lawrence T. Restaino (Canton, OH)
Primary Examiner: Melvin B. Feifer
Attorney: Joseph Frease
Application Number: 5/807,593
Classifications
