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| All Patents in class 16/384 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,847,757 | Mar. 01, 1932 | H.M. Gasstrom | Folding Rule Hinge | folding rule joints | |
| 3,439,378 | Apr. 22, 1969 | J.W. Ennis | Hinge | hinges | |