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| All Patents in class 212/170 | |||||
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| Number | Date | Patentee | Title | Type | |
| 575,383 | Jan. 19, 1897 | T.E. Spotswood | Log Hoist for Log Carts | logging trucks | |
| 651,972 | Jun. 19, 1900 | S. Mattson | Derrick apparatus | hoists, winches, come-alongs | |