| All Patents in class 91 |
Patents 406 -
420
of 809
      |
| Number | Date | Patentee | Title | Type |
| 1,244,664 | Oct. 30, 1917 | H.E. Warren | Fluid-operated lathe | metal lathes |
| 1,255,315 | Feb. 05, 1918 | F.A. Jimerson | Ratchet operating mechanism for drills | pneumatic motors |
| 1,259,045 | Mar. 12, 1918 | A.L. Proske, T.H. Proske | Drill Sharpener | |
| 1,260,184 | Mar. 19, 1918 | J.C. Glenn | Fluid-Operated Valve Mechanism | steam engine valves |
| 1,267,130 | May 21, 1918 | W.B. Burrows, I.L. Skeith | Power Lifting Mechanism for Saw Trimmers | circular saw accessories |
| 1,268,270 | Jun. 04, 1918 | R.W. Nazel | Fluid-power hammer | drop hammers |
| 1,275,688 | Aug. 13, 1918 | T.E. Holmes | Combined Steam Hammer and Forging Press | steam hammers |
| 1,276,167 | Aug. 20, 1918 | S.K. Brown | Surface Finishing Machine | |
| 1,283,145 | Oct. 29, 1918 | J.C. Gaskill | Steam Engine | steam engines |
| 1,283,738 | Nov. 05, 1918 | R. Green | Sawing Machine | sawmill carriages |
| 1,285,475 | Nov. 19, 1918 | W. Turnwald | Automatic exhaust-valve | steam engine valves |
| 1,286,122 | Nov. 26, 1918 | C.E. Sargent | Motor for Railroad Vehicles | internal combustion engines |
| 1,293,713 | Feb. 11, 1919 | H.A. Chuse | Steam Engine | steam engine valves |
| 1,353,656 | Sep. 21, 1920 | C.L. Heisler | Fluid Operated Motor | steam turbines |
| 1,385,134 | Jul. 19, 1921 | F.A. Jimerson | Bit-chuck retainer | drill press chucks |
