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| All Patents in class 494/42 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,775,309 | Dec. 25, 1956 | E.M. Villchur | Sound translating devices | ||
| 3,430,851 | Mar. 04, 1969 | R.C. Abt | Automatic Centrifuge Apparatus | electrochemical machining | |