| All Patents in class 74/341 |
Patents 16 -
28
of 28
      |
| Number | Date | Patentee | Title | Type |
| 840,669 | Jan. 08, 1907 | L. Thiel | Variable Speed Mechanism | metalworking speed changing mechanisms |
| 840,670 | Jan. 08, 1907 | L. Thiel | Variable Speed Mechanism | metalworking variable speed mechanisms |
| 840,671 | Jan. 08, 1907 | L. Thiel | Variable Speed Mechanism | metalworking variable speed mechanisms |
| 855,068 | May 28, 1907 | J. Parker | Gearing | milling machines |
| 918,773 | Apr. 20, 1909 | H.W. Schatz | Variable Speed Mechanism | |
| 955,488 | Apr. 19, 1910 | F. Welker | Variable-speed gearing | woodworking machine mechanisms |
| 1,019,798 | Mar. 12, 1912 | T. Trecker, E.J. Kearney | Speed-changing gearing | milling machines |
| 1,170,097 | Feb. 01, 1916 | J. Parker | Speed changing and reversing mechanism | metalworking machine mechanisms |
| 1,231,880 | Jul. 03, 1917 | N.W. Hagen, L. Thiel | Gearing | industrial machine gearing |
| 1,334,242 | Mar. 16, 1920 | F. Hardinge | Gear mechanism | metal lathes |
| 2,167,748 | Aug. 01, 1939 | S.C. Gebert | Variable Speed Gear Transmission | industrial machine gearing |
| 2,344,039 | Mar. 14, 1944 | F.W. Hack | Multiversal Machine Tool and Boring Head Therefor | vertical boring mills |
| 3,058,365 | Oct. 16, 1962 | W.R. Gerchow | Speed change device | |
