US Patent: 1,990,478
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| Drop hammer
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Patentee:
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| Reginald P. 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: |
Feb. 26, 1931 |
| Granted: |
Feb. 12, 1935 |
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Jeff Joslin
Vintage Machinery entry for Pneumatic Drop Hammer Co.
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Description: |
| A drop hammer "which can be used in buildings above the ground floor thereof without causing vibration to the buildings or floors thereof." |
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