| Patents for William A. Barr |
Patents 31 -
45
of 53
      |
| Number | Date | Patentee | Title | Type |
| 939,829 | Nov. 09, 1909 | J.R. Grundy | Insulating shaft-coupling | industrial machine shaft couplings |
| 952,320 | Mar. 15, 1910 | T.J. Fegley | North Bros. version of the Millers Falls "protected spring" design. | drill accessories |
| 967,055 | Aug. 09, 1910 | J.T. Pugh | Auger-Bit | auger bits |
| 968,372 | Aug. 23, 1910 | G.O. Leopold | Ball-bearing | tool making machines |
| 977,957 | Dec. 06, 1910 | G.O. Leopold | Ratchet Mechanism for Screw-Drivers, &c. | ratcheting screwdrivers |
| 979,939 | Dec. 27, 1910 | G.O. Leopold, T.J. Fegley | Spiral tool-driver | hand drills |
| 979,967 | Dec. 27, 1910 | R.J. Koeberle | Saw-Clamp | saw vises |
| 982,510 | Jan. 24, 1911 | G.O. Leopold | Ratchet mechanism | eggbeater drills |
| 1,008,164 | Nov. 07, 1911 | G.O. Leopold | Ratchet Screw-Driver | ratcheting screwdrivers |
| 1,015,235 | Jan. 16, 1912 | G.O. Leopold | Gearing | eggbeater drills |
| 1,021,538 | Mar. 26, 1912 | G.O. Leopold | Gearing | eggbeater drills |
| 1,022,311 | Apr. 02, 1912 | T.J. Fegley | Spiral Screw-Driver and Drill | spiral screwdrivers |
| 1,023,023 | Apr. 09, 1912 | G.O. Leopold | Gearing | hand drills |
| 1,041,451 | Oct. 15, 1912 | T.J. Fegley, G.O. Leopold | Means for attaching blades of tools to handles | screwdrivers |
| D43,803 | Apr. 01, 1913 | G.O. Leopold | Design for a frame of bench-drills | drill presses |
