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| All Patents in class 24/508 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,519,652 | Aug. 22, 1950 | J.M. Hargrave | Spring clamp with adjustable clamping force | spring clamps | |
| 2,667,678 | Feb. 02, 1954 | J.M. Hargrave | Hand clamps | spring clamps | |