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| All Patents in class 177/DIG.006 | |||||
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| Number | Date | Patentee | Title | Type | |
| 307,031 | Oct. 21, 1884 | T.A. Edison | Electrical indicator | rectifiers | |
| 2,963,222 | Dec. 06, 1960 | K.C. Allen | Computing and ticket printing scale | ||