US Patent: RE10,949
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| Coin Operated Induction Coil
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Patentees:
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| Percy G. Williams (exact or similar names) - Brooklyn, NY |
| Wilfred W. Roovers (exact or similar names) - Brooklyn, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 20, 1888 |
| Granted: |
Jul. 24, 1888 |
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Russ Allen
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Description: |
| said Roovers assignor to said Williams |
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