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| All Patents in class 451/918 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,409,343 | Mar. 14, 1922 | S. Karasick | Sine Angle Plate | sine bars | |
| 2,315,104 | Mar. 30, 1943 | W.G. Baldenhofer | Inclinable grinder spindle | surface grinders | |
| 2,347,111 | Apr. 18, 1944 | J. Jesionowski | Sine vise | angle bars and angle plates | |
| 2,365,436 | Dec. 19, 1944 | L.H. Saucier | Adjustable Angle Plate | angle bars and angle plates | |