Educational toy frame
United States Patent 3004364
US Patent References:
/0927545.html
- - 0927545

/1370303.html
- - 1370303

Sheet-metal building
- - 1461538

Toy building. block
- - 1492560

Building block
- - 1608273


Inventors:
Benkelman, Glen F.
Publication Date:
10/17/1961
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Assignee:
Benkelman, Glen F.
Primary Class:
446/122
Other Classes:
446/124
International Classes:
A63H33/10; A63H33/04
US Patent References:
1973536Structural toy
2052600Machine construction
Foreign References:
GB213861A
FR747860A
GB664998A