| All Patents in class 451/156 |
Patents 1 -
10
of 16
      |
| Picture | Number | Date | Patentee | Title |
| | 1,731,482 | Oct. 15, 1929 | L.F. Nenninger, H. Ernst | Spindle Oscillator |
| | 1,783,019 | Nov. 25, 1930 | A.M. Johnson | Honing machine |
| | 1,872,746 | Aug. 23, 1932 | A.M. Johnson | Honing machine |
| | 1,877,881 | Sep. 20, 1932 | A.M. Johnson | Honing machine |
 | 1,920,290 | Aug. 01, 1933 | W.L. Bryant | Grinding machine or the like |
| | 1,938,758 | Dec. 12, 1933 | H. Ernst | Spindle Oscillator |
| | 2,000,614 | May 07, 1935 | E.G. Roehm | Grinding Machine |
| | 2,006,570 | Jul. 02, 1935 | F.S. Haas | Grinding Machinery |
| | 2,043,408 | Jun. 09, 1936 | E.F. Haas | Grinding Machine |
 | 2,076,808 | Apr. 13, 1937 | W.L. Bryant | Grinding machines |
