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| All Patents in class 191/93 | |||||
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| Number | Date | Patentee | Title | Type | |
| 476,028 | May 31, 1892 | M.A. Yeakley | Safety attachment for railway-trolleys | railroad cars and carriages | |
| 1,143,874 | Jun. 22, 1915 | M.A. Yeakley | Trolley retriever or safety device | railroad cars and carriages | |