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| All Patents in class 318/277 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,441,291 | May 11, 1948 | E.J. Riveira | Spindle Positioning Mechanism | metalworking machine mechanisms | |
| 2,500,150 | Mar. 14, 1950 | E.P. Bullard, L.J. Baudis, C.M. Grinage | Positining Apparatus | ||
| 2,790,280 | Apr. 30, 1957 | R.L. Henry, J.W. Wilson | Spindle Positioning Mechanism | grinding machines | |