| All Patents in class 91 |
Patents 436 -
450
of 806
      |
| Number | Date | Patentee | Title | Type |
| 1,575,968 | Mar. 09, 1926 | W.L. Bryant | Grinding machine | grinders |
| 1,580,094 | Apr. 06, 1926 | A. White | Tool-operating machine | mortising machines |
| 1,582,976 | May 04, 1926 | J.W. Gardner | Valve Mechanism | steam engine governors |
| 1,621,495 | Mar. 22, 1927 | C.M. Conradson | Rotary Pump | rotary pumps |
| 1,650,642 | Nov. 29, 1927 | H.G. Mueller | Steam Engine | steam engines |
| 1,650,643 | Nov. 29, 1927 | H.G. Mueller | Steam Engine | steam engines |
| 1,653,350 | Dec. 20, 1927 | W. Ernst | High Speed Hydraulic Press | hydraulic presses |
| 1,668,927 | May 08, 1928 | J. Stumpf | Noncondensing steam engine | steam engines |
| 1,671,074 | May 22, 1928 | W.G. Hagmaier | Carriage feed | sawmill feed works |
| 1,672,561 | Jun. 05, 1928 | W. Ernst | High Speed Hydraulic Press | hydraulic presses |
| 1,684,729 | Sep. 18, 1928 | R.J. Denio | Automobile elevating apparatus | vehicle mechanic |
| 1,686,245 | Oct. 02, 1928 | H.G. Mueller | Reciprocating Steam Engine | steam engines |
| 1,687,369 | Oct. 09, 1928 | F.J. Lapointe | Hydraulic broaching machine | broaching machines |
| 1,693,109 | Nov. 27, 1928 | W. Ernst | Semiautomatic Valve | hydraulic valves |
| 1,696,868 | Dec. 25, 1928 | A.D. Skinner | Valve | steam engine valves |
