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United States Patent 2506509
Inventors:
Kratkowski, John F.
Publication Date:
05/02/1950
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Assignee:
Kratkowski, John F.
Primary Class:
Other Classes:
63/DIG.003, 40/757, 428/28, D11/83
International Classes:
A47G1/06
Foreign References:
| DE5418C | ||||
| GB190612384A |