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| Patents Granted on 1983-09-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,404,727 | Sep. 20, 1983 | F. Zankl | Machine Tool Operable as Both a Chucking Type Lathe and as a Machining Center | milling machine accessories | |
| 4,404,799 | Sep. 20, 1983 | E.C. Dudek | Pneumatic tool with muffler | ||