All Patents of Type: metalworking twist drills |
Patents 1 -
11
of 11
|
Number | Date | Patentee | Title | Type |
74,870 | Feb. 25, 1868 | P.A. Whitney | Drill and Countersink | metalworking countersinks |
339,544 | Apr. 06, 1886 | S.P. Graham | Combined boring-tool and holder | metalworking twist drills |
CA-24,874 | Sep. 03, 1886 | S.P. Graham | Combined drill and bit shank and holder | metalworking twist drills |
451,896 | May 05, 1891 | J.E. Merritt | Twist Drill | metalworking twist drills |
854,144 | May 21, 1907 | P. Broadbooks | Drill Bit | metalworking twist drills |
867,639 | Oct. 08, 1907 | G.J. Bragg | Twist Drill | metalworking twist drills |
1,264,370 | Apr. 30, 1918 | L. Groff | Drill | metalworking twist drills |
2,148,805 | Feb. 28, 1939 | S.A. Cogsdill | Method of Making Oil Hole Drills | metalworking twist drills |
2,358,304 | Sep. 19, 1944 | S.A. Cogsdill | Method of Making Oil Hole Twist Drills | metalworking twist drills |
2,555,302 | Jun. 05, 1951 | G.H. Cogsdill | Twist Drill | metalworking twist drills |
2,811,875 | Nov. 05, 1957 | S.A. Cogsdill | Twist Drill Having Oil Passages Therein and Method of Construction | metalworking twist drills |