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| Patents for Robert G. Henry | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 278,225 | May 22, 1883 | R. Crittenden, R.G. Henry | Calipers | |
 | 795,123 | Jul. 18, 1905 | D.M. Wright, R.G. Henry | Drill-spindle | |
 | 805,546 | Nov. 28, 1905 | R.G. Henry, D.M. Wright | Drill-spindle-driving mechanism | |
 | 825,273 | Jul. 03, 1906 | R.G. Henry | Feed mechanism for drill-spindles | |
 | 928,489 | Jul. 20, 1909 | W.G. Allen, R.G. Henry | Screw-thread-cutting mechanism | |
 | 1,073,683 | Sep. 23, 1913 | W.J. Bayrer, R.G. Henry | Belt-shifter | |