| All Patents in class 470/181 |
Patents 31 -
45
of 60
      |
| Number | Date | Patentee | Title | Type |
| 1,582,669 | Apr. 27, 1926 | H.E. Durkee | Screw Thread Cutting Means for Bench Lathes | screwcutting lathes |
| 1,607,614 | Nov. 23, 1926 | J.H. Graham | Tapping machine | tapping machines |
| 1,752,422 | Apr. 01, 1930 | A.G. Decker | Portable electric tapper | handheld power tool accessories |
| 1,786,148 | Dec. 23, 1930 | E.P. Bullard, Jr. | Station-Type Drilling and Tapping Machine | |
| 1,796,790 | Mar. 17, 1931 | E.S. Ingraham | Attachment for automatic screw machines | |
| 1,852,736 | Apr. 05, 1932 | E.L. Connell | Drilling or tapping machine | |
| 1,883,728 | Oct. 18, 1932 | J.F. Haas | Portable power driven threading machine | handheld power tools |
| 1,975,008 | Sep. 25, 1934 | E.J. Kingsbury | Machine tool having an indexing movement | metalworking machine mechanisms |
| 1,988,967 | Jan. 22, 1935 | G.W. Emrick | Clutch device | tapping heads and chucks |
| 2,089,228 | Aug. 10, 1937 | L.L. Schauer, J.H. McKewen | Combination drilling and tapping control | tapping machines |
| 2,161,548 | Jun. 06, 1939 | C.E. Miller | Threading Mechanism | automatic lathes |
| 2,189,422 | Feb. 06, 1940 | G.W. Irwin | Combined drilling and tapping machine | drill presses |
| 2,231,465 | Feb. 11, 1941 | G.W. Emrick | Tapping attachment | tapping heads and chucks |
| 2,236,440 | Mar. 25, 1941 | C.E. Miller | Automatic Multiple Spindle Machine | automatic lathes |
| 2,253,493 | Aug. 26, 1941 | H.F. Bakewell | Machine tool | tapping machines |
