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| Patents for H. E. Hartwell | |||||
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| Number | Date | Patentee | Title | Type | |
| D44,834 | Nov. 04, 1913 | E.A. Bardwell | Nail Set | pin punches | |
| 1,090,180 | Mar. 17, 1914 | F. Judge, F.O. Wells | Calipering Gage for Screw Threads | measurement gauges | |
| 1,145,852 | Jul. 06, 1915 | W. Schramm | Calipers | measurement gauges | |
| 1,152,761 | Sep. 07, 1915 | M.E. Provost | Micrometer Gage | micrometers | |