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| Patents for Louis T. Harkness | |||||
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| Number | Date | Patentee | Title | Type | |
| 937,241 | Oct. 19, 1909 | L.T. Harkness | Tool Holder | lathe tool holders and tool posts | |
| 1,942,625 | Jan. 09, 1934 | L.T. Harkness, J.P. Whalan | Wire Grip | ||
| 1,994,972 | Mar. 19, 1935 | L.T. Harkness, J.P. Whalan | Wire and Sleeve Connector Tool | wire connector tools | |
| 1,994,973 | Mar. 19, 1935 | L.T. Harkness, J.P. Whalan | Wire and Sleeve Connecter Tool | ||