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| Patents for H. M. Christman | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,273,421 | Jul. 23, 1918 | C.H. Taylor | Thread or worm cutter | lathe tools | |
| 1,276,445 | Aug. 20, 1918 | C.H. Taylor | Thread-cutter | lathe tools | |
| 1,308,126 | Jul. 01, 1919 | C.H. Taylor | Gear making attachment for turret lathe | gear making machines | |