US Patent: 447,535
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Rotary Engine
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Patentees:
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William G. Billings (exact or similar names) - Larned, Pawnee County, KS |
Avery W. Billings (exact or similar names) - Larned, Pawnee County, KS |
Manufacturer: |
Not known to have been produced |
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Patent Dates:
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Applied: |
Jun. 23, 1890 |
Granted: |
Mar. 03, 1891 |
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Joel Havens
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