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| Patents for P. P. Burtis | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 156,066 | Oct. 20, 1874 | E. Schlenker | Improvement in vises | |
 | 162,194 | Apr. 20, 1875 | E. Schlenker | Improvement in bolt-threading machines | |
 | 166,730 | Aug. 17, 1875 | E. Schlenker | Improvement in hoisting-machines or elevators | |
 | 168,135 | Sep. 28, 1875 | O.C. Burdict | Machine For Forging Wrench-Bar Heads | |
 | 182,230 | Sep. 12, 1876 | E. Schlenker | Improvement in paper-cutting machines | |