| All Patents in class 451/6 |
Patents 1 -
10
of 20
      |
| Picture | Number | Date | Patentee | Title |
| | 354,740 | Dec. 21, 1886 | W.A. Rogers | Measuring devices for lathe |
 | 1,794,340 | Feb. 24, 1931 | M.K. Parkhurst | Optical Measuring Device |
| | 1,993,830 | Mar. 12, 1935 | R.E. Conover | Grinding Machine |
| | 2,042,257 | May 26, 1936 | R.E. Harrison, C.W. Hopkins | Machine Tool |
 | 2,086,153 | Jul. 06, 1937 | C.A. Bickel | Apparatus for Control of Machine Tools |
 | 2,125,584 | Aug. 02, 1938 | E. Rotzoli | Adjusting Device for Machine Tools |
 | 2,169,159 | Aug. 08, 1939 | G. Müller | Means for Accurate Screw Cutting |
 | 2,220,268 | Nov. 05, 1940 | J.O. Olsen | Machine tool |
| | 2,263,404 | Nov. 18, 1941 | O.W. Barker, J.B. Armitage | Boring and Milling Machine |
 | 2,311,142 | Feb. 16, 1943 | F. Turrettini | Precision Machine Tool |
