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| Patents for Harry J. Smith | |||||
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| Number | Date | Patentee | Title | Type | |
| D34,935 | Aug. 13, 1901 | H.J. Smith | Gas Engine Frame or Casing | internal combustion engines | |
| 757,064 | Apr. 12, 1904 | H.J. Smith | Electric Igniter for Gas Engines | ignition systems | |
| 801,927 | Oct. 17, 1905 | H.J. Smith | Fuel Mixing Device for Gas Engines | carburetors | |
| 818,714 | Apr. 24, 1906 | H.J. Smith | Valve Mechanism for Gas Engines | internal combustion engine valves | |