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| All Patents in class 279/2.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,346,812 | Jul. 20, 1920 | E.W. Duston | Collapsible spool | ||
| 2,528,873 | Nov. 07, 1950 | J.A. Dorman | Pipe Chuck | pipe and chain vises | |