| All Patents in class 74/397 |
Patents 1 -
12
of 12
      |
| Number | Date | Patentee | Title | Type |
| 294,221 | Feb. 26, 1884 | J.R. Gorrell, J. Miller | Circular saw mill | circular sawmills |
| 534,008 | Feb. 12, 1895 | F.A. Pratt | Drop Hammer | drop hammers |
| 700,647 | May 20, 1902 | J. Hartness | Power Transmission Mechanism | metalworking machine clutches |
| 702,895 | Jun. 17, 1902 | C.O. White | Sparking Device | ignition systems |
| 860,046 | Jul. 16, 1907 | C.R. Meston | Machine-operating mechanism | electric motors |
| 871,193 | Nov. 19, 1907 | E.W. Stull | Arrangement for motor-drives | motor controls |
| 1,739,826 | Dec. 17, 1929 | O. Cullman | Electric Low Speed Unit | industrial machine speed and direction changing mechanisms |
| 1,786,192 | Dec. 23, 1930 | O. Cullman | Support for Electric Motors | motor mounts |
| 2,195,912 | Apr. 02, 1940 | W.F. Zimmermann | Worm Gearing | gear hobbing machines |
| 2,549,490 | Apr. 17, 1951 | G.H. Kuhl | Multiple spindle drill gearing | multiple spindle drill presses |
| 3,011,358 | Dec. 05, 1961 | M.B. Moore | Gearhead | industrial machine gearing |
| 3,220,276 | Nov. 30, 1965 | E.C. Bruns | Position Analog Unit for Automatic Controls | machine tool controls |
