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| All Patents in class 411/190 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,897,666 | Feb. 14, 1933 | F.O. Hoagland | Machine Tool Spindle | metalworking power transmission | |
| 3,017,643 | Jan. 23, 1962 | J.W. Lehde, Jr. | Adjustable Tap Stop Means for Limiting Depth of Threading | tap and die holders | |