| Patents for James S. Knowlson |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 1,082,880 | Dec. 30, 1913 | J.S. Knowlson | Mechanical hammer | miner |
| 1,298,966 | Apr. 01, 1919 | J.S. Knowlson | Electrically-operated tool | impact riveters |
| DE-390,538 | Feb. 20, 1924 | J.S. Knowlson | electrically driven impact tool | impact riveters |
| 1,577,976 | Mar. 23, 1926 | J.S. Knowlson, R.S. McKeage | Power-driven tool-operating device | handheld power drills |
| 1,598,088 | Aug. 31, 1926 | J. Larocca, J.S. Knowlson | Mechanical movement | impact chisels and drills |
| 1,782,927 | Nov. 25, 1930 | J.S. Knowlson | Electric power device | handheld power rotary tools |
| 1,782,928 | Nov. 25, 1930 | J.S. Knowlson | Humidifier | air conditioning apparatus |
