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| Patents for J. P. Theodore Lang | |||||
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| Number | Date | Patentee | Title | Type | |
| 79,767 | Jul. 07, 1868 | J.T. Lang | Improvement in Screw Cutting Lathes | screwcutting lathes | |
| 193,088 | Jul. 17, 1877 | B. Holly | Improvement in Street Mains or Pipes for Supplying Large Districts with Heat for Warming Buildings | steam apparatus | |