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| Patents for Peter L. Robertson | |||||
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| Number | Date | Patentee | Title | Type | |
| 800,682 | Oct. 03, 1905 | P.L. Robertson | Corkscrew | mechanical cork extractors | |
| 815,381 | Mar. 20, 1906 | P.L. Robertson | Combination-tool | ||
| 1,824,623 | Sep. 22, 1931 | P.L. Robertson | Tool Holder | tool holders | |