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| All Patents in class 74/412.0TA | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,236,854 | Apr. 01, 1941 | W.F. Ocenasek | Inertia eliminator | ||
| 3,816,016 | Jun. 11, 1974 | E.W. Schatzman | Power drilling machine with resistance triggered retraction | drill presses | |