| All Patents in class 74/318 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 900,144 | Oct. 06, 1908 | J.W. Havens, D. Barnes | Combination Tool | breast drills |
| 930,620 | Aug. 10, 1909 | J.R. Sandberg | Combined breast-drill and valve-grinder | breast drills |
| 963,986 | Jul. 12, 1910 | F.C. Blanchard | Combination drill and valve-grinder | eggbeater drills |
| 977,258 | Nov. 29, 1910 | O.R. Angell | Combined valve grinder and drill | eggbeater drills |
| 1,017,242 | Feb. 13, 1912 | A.B. Browne | Combined Breast Drill and Valve Grinder | combination tools |
| 1,503,206 | Jul. 29, 1924 | A.W. Ojerholm | Combination valve grinder and drill | valve and seat maintenance |
