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| Patents for L. L. Markel | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,169,115 | Jan. 25, 1916 | W.J. Bayrer | Power-transferring mechanism | drill presses | |
| 1,187,109 | Jun. 13, 1916 | H.A. Stuernagel | Locking mechanism | bar and pipe clamps | |
| 1,233,994 | Jul. 17, 1917 | R.F. Dow | Machine for taper-forming | metal lathes | |
| 1,248,866 | Dec. 04, 1917 | L.W. Jacobs | Miter box | miter boxes | |