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| Patents for B21F 35 - Making springs from wire (1,103) |
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| 06/22/1976 | US3964736 Helical extension spring and method of making same | | 02/10/1976 | US3937256 Apparatus for manufacturing corner springs | | 01/27/1976 | US3935413 Apparatus for stress relieving springs and the like |
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