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| Patents for Parker C. Hancock | |||||
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| Picture | Number | Date | Patentee | Title | |
| 115,600 | Jun. 06, 1871 | J.S. Crane, J.T. Gilmore | Improvement in Machines for Dressing Millstones | ||
 | 210,421 | Dec. 03, 1878 | G.W. Griffin | Improvement in scroll-saws | |
 | 412,176 | Oct. 01, 1889 | G.W. Griffin | Coping Saw-Blade | |