DOUBLET GEM CONSTRUCTION
United States Patent 3528261
US Patent References:
/0138314.html
- - 0138314

Optically glass-like material
- - 2628156

Instructional building blocks
- - 2839841


Inventors:
Jones, Harry S.
Publication Date:
09/15/1970
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Assignee:
Jones, Harry S.
Primary Class:
63/32
Other Classes:
65/61, 359/615, 65/36
International Classes:
A44C17/00; A44C17/00
Foreign References:
FR560188A




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