| All Patents of Type: handheld power drills |
Patents 1 -
15
of 109
      |
| Number | Date | Patentee | Title | Type |
| 255,236 | Mar. 21, 1882 | C.E. Ball | Electric drill | handheld power drills |
| AU-1,890,000,001 | Aug. 20, 1889 | W.B. Brain, A.J. Arnot, F. Baker | Improved electrical rock-drill, coal-digger, or earth-cutter | handheld power drills |
| 507,752 | Oct. 31, 1893 | C.H. Peck | Portable drilling-machine | handheld power drills |
| GB-189,614,187 | Aug. 01, 1896 | E. Holmes | A portable electric drill | handheld power drills |
| 606,549 | Jun. 28, 1898 | E. Holmes | Portable electric drill | handheld power drills |
| 676,043 | Jun. 11, 1901 | J.C. Lincoln | Electric drill | handheld power drills |
| 752,223 | Feb. 16, 1904 | C.S. Hisey | Variable-speed mechanism | handheld power drills |
| 805,499 | Nov. 28, 1905 | S.D. Stoycheff | Electric drill | handheld power drills |
| 866,922 | Sep. 24, 1907 | W.O. Duntley | Engine | pneumatic tools |
| 871,086 | Nov. 12, 1907 | W.O. Duntley, G.H. Hayes | Engine | pneumatic tools |
| D38,945 | Dec. 10, 1907 | E.F. Smith | Design for a housing for electric drills | handheld power drills |
| 904,851 | Nov. 24, 1908 | W.O. Duntley, H.J. Kimman | Controller for electric drills | handheld power drills |
| 908,726 | Jan. 05, 1909 | F.J. Backscheider | Portable electric tool | handheld power drills |
| 912,655 | Feb. 16, 1909 | W.O. Duntley | Pneumatic-tool handle | pneumatic tools |
| 991,431 | May 02, 1911 | W.O. Duntley | Controller for electric drills | handheld power drills |
