BLACKBOARD
United States Patent 3432944
US Patent References:
/0086177.html
- - 0086177

/0467561.html
- - 0467561

/0572004.html
- - 0572004

Blackboard
- - 1865863

Blackboard frame construction
- - 1991882


Inventors:
Ishida, Toyo
Publication Date:
03/18/1969
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Assignee:
Toyo, Ishida
Primary Class:
434/417
Other Classes:
434/425
International Classes:
B43L1/06; B43L1/00; B43L1/04; B43L1/10
US Patent References:
2517069Laminated panel and method of making the same
2643466Game instruction apparatus
2869263Display frame having detachable interlocking joints
2951299Chalkboard surface
2968876Method and apparatus for displaying conditions of vehicle traffic and accidents incidental thereto
3130113Self-adhesive decorative surface covering material
Foreign References:
GB189205846A




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