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| All Patents in class 318/275 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,441,291 | May 11, 1948 | E.J. Riveira | Spindle Positioning Mechanism | ||
| 2,753,502 | Jul. 03, 1956 | H.O. Kylin | Electric Motor Control for Spindle Postioner | ||