US Patent: 437,941
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| Steam-engine
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Patentee:
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| Frank A. Shoemaker (exact or similar names) - Buffalo, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 06, 1890 |
| Granted: |
Oct. 07, 1890 |
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Joel Havens
"Vintage Machinery" entry for J. W. Dennis
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Description: |
| "This invention relates to that class of reciprocating steam-engines which are provided with two single-acting pistons secured together and moving in cylinders arranged in line with each other." |
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