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| Patents for H. P. Harwood | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,241,282 | Sep. 25, 1917 | F. Hughes, A.M. Remer | Combination-Square | squares | |
| 1,263,191 | Apr. 16, 1918 | H.P. Benner | Saw Set | saw sets | |
| 1,353,682 | Sep. 21, 1920 | L. Viezzi | Scribing Attachment for Square | marking gauges | |