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| Patents for H. W. True | |||||
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| Number | Date | Patentee | Title | Type | |
| 555,442 | Feb. 25, 1896 | W.L. Fifield | Chain Drill | drill chucks | |
| 998,939 | Jul. 25, 1911 | E.M. Worden | Tool For Operating Upon Cotter Pins | pliers | |