| All Patents in class 408/234 |
Patents 31 -
45
of 109
      |
| Number | Date | Patentee | Title | Type |
| 1,399,599 | Dec. 06, 1921 | G.K. Atkinson | Drilling-machine | drill presses |
| 1,411,538 | Apr. 04, 1922 | A.H. Sweetland | Hand drill | handheld power drills |
| 1,486,968 | Mar. 18, 1924 | H.E. Kempton | Precision Device for Boring Machines and the Like | horizontal boring mill attachments |
| 1,493,141 | May 06, 1924 | C. Bodmer | Hand drill frame | eggbeater drills |
| 1,493,143 | May 06, 1924 | C. Bodmer | Hand drill pedestal | |
| 1,512,231 | Oct. 21, 1924 | O.W. Mueller | Safety means for drilling machines | radial drill presses |
| 1,519,090 | Dec. 09, 1924 | D.C. Klausmeyer | Radial Drill Base Construction | radial drill presses |
| 1,538,317 | May 19, 1925 | F.T. Flinchbaugh | Portable Reboring Machine for Engine Cylinders | portable metal drilling machines |
| 1,557,241 | Oct. 13, 1925 | J.C. Carlton | Friction Clutch | radial drill presses |
| 1,564,460 | Dec. 08, 1925 | F.L. Young | Drill | handheld power drills |
| 1,573,551 | Feb. 16, 1926 | D.C. Klausmeyer | Peep Hole for Threads | radial drill presses |
| 1,649,060 | Nov. 15, 1927 | A.G. Decker | Portable power-driven rotary tool with spindle latch and hand-operated chuck | handheld power drills |
| 1,659,978 | Feb. 21, 1928 | D.C. Klausmeyer | Telescopic Guard System for Drills | drill press accessories |
| 1,680,214 | Aug. 07, 1928 | G. Feather | Electrically-driven radial drill | radial drill presses |
| 1,700,975 | Feb. 05, 1929 | J.F. Buhr | Drill Head | drill press accessories |
