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