US Patent: 331,360
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| Piston for Air Pumps
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Patentees:
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| James A. Woodbury (exact or similar names) - Winchester, Middlesex County, MA |
| Joshua Merrill (exact or similar names) - Boston, Suffolk County, MA |
| George Patten (exact or similar names) - Boston, Suffolk County, MA |
| Edward F. Woodbury (exact or similar names) - Boston, Suffolk County, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 13, 1885 |
| Granted: |
Dec. 01, 1885 |
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Joel Havens
"Vintage Machinery" entry for Woodbury, Merrill, Patten and Woodbury Air Engine Co.
The Woodbury Hot Air Engine
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