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| Patents for Robert Head | |||||
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| Number | Date | Patentee | Title | Type | |
| 719,061 | Jan. 27, 1903 | J.A. Traut | Leveling Instrument | inclinometers | |
| 805,838 | Nov. 28, 1905 | P. Broadbooks | Combination Drill and Drill Frame | portable metal drilling machines | |