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| All Patents in class 83/599 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,899,950 | Aug. 19, 1975 | J. Dvorak | Bar shear | metal shearing machines | |
| 5,170,689 | Dec. 15, 1992 | J. Dvorak | Metal working machine | metal punching machines | |