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| All Patents in class 254/337 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,422,459 | Jul. 11, 1922 | R.E. Manley | Portable floor crane | cranes | |
| 2,549,120 | Apr. 17, 1951 | A.E. Ormsby | Crane | jib cranes | |