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| All Patents in class 74/552 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,570,251 | Jan. 19, 1926 | F.O. Hoagland | Collet and collet mechanism | collets and collet holders | |
| 1,769,517 | Jul. 01, 1930 | M.G. Ivandick | Circuit closure | ||