US Patent: 2,263,680
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| Drop hammer
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Patentees:
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| Reginald P. Fitzgerald (exact or similar names) - Braintree, MA |
| William H. J. Fitzgerald (exact or similar names) - Braintree, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 08, 1937 |
| Granted: |
Nov. 25, 1941 |
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Jeff Joslin
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