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| Patents for J. D. Gray | |||||
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| Number | Date | Patentee | Title | Type | |
| 640,308 | Jan. 02, 1900 | H.E. Koch | Wrench | pipe tongs | |
| 795,160 | Jul. 18, 1905 | M. Nicholls | Rafter Attachment for Steel Squares | bevels | |