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| All Patents in class 187/414 | |||||
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| Number | Date | Patentee | Title | Type | |
| 822,186 | May 29, 1906 | P.E. Chapman | Elevator safety-alarm | elevators and lifts | |
| 1,573,551 | Feb. 16, 1926 | D.C. Klausmeyer | Peep Hole for Threads | radial drill presses | |