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Patents for John Root | |||||
Number | Date | Patentee | Title | Type | |
75,198 | Mar. 03, 1868 | J. Root | Improved bolt-heading machine | nut or bolt making machines | |
88,214 | Mar. 23, 1869 | J. Root | Improved bolt-heading machine | nut or bolt making machines | |
100,928 | Mar. 15, 1870 | J. Root | Improved machine for heading bolts | nut or bolt making machines |