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| Patents for Pearl H. Robinson | |||||
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| Number | Date | Patentee | Title | Type | |
| 810,307 | Jan. 16, 1906 | P.H. Robinson | Tool-holder | lathe tool holders and tool posts | |
| 878,672 | Feb. 11, 1908 | P.H. Robinson | Tool Holder | lathe tools | |
| 1,056,089 | Mar. 18, 1913 | P.H. Robinson, G.W. Conklin | Tool-holder | lathe tool holders and tool posts | |