| Patents for P. H. Watson |
Patents 16 -
21
of 21
      |
| Number | Date | Patentee | Title | Type |
| 9,722 | May 17, 1853 | T.A. Chandler | Pendulum Level | inclinometers |
| 9,961 | Aug. 23, 1853 | L.A. Walbach | Boring cannon | drilling and boring |
| 10,276 | Nov. 29, 1853 | R.R. Taylor | Arrangement of valves, ports, and passages for operating steam-hammers | steam hammers |
| 10,338 | Dec. 20, 1853 | W.I. Hatfield | Machine for jointing table-tops | matchers |
| 11,473 | Aug. 08, 1854 | D. Close | Sawing and planing machine | wood planers |
| 12,170 | Jan. 02, 1855 | J.A. Taplin | Method of hanging path-finding saws | reciprocating sawmills |
