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| All Patents in class 74/661 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,900,384 | Mar. 07, 1933 | M. Kahr | Power Plant for Drilling Apparatus | oilfield machinery | |
| 3,184,810 | May 25, 1965 | J.H. Hoern | Die casting and pressure molding machines | foundryman | |
| 3,483,767 | Dec. 16, 1969 | J.J. Schachte | Apparatus for Angularly Positioning a Spindle | metalworking machine mechanisms | |