US Patent: 27,704
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Steam-engine
Improved steam-trap
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Patentee:
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| Frank Douglas (exact or similar names) - Norwich, CT |
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Patent Dates:
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| Granted: |
Apr. 03, 1860 |
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Joel Havens
"Vintage Machinery" entry for C. B. Rogers & Co.
"Vintage Machinery" entry for Frank Douglas Machinery Co.
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Description: |
| An article in 1860-05-05 Scientific American about this invention concludes, "The patent for this invention was obtained by Frank Douglas... and further information in relation to it may be obtained by addressing Douglas, Rogers & Co., Norwich, Conn." |
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