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| All Patents in class 116/232 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,536,030 | Oct. 27, 1970 | W. Schroeder | Metric/Inch Converter | ||
| 4,058,080 | Nov. 15, 1977 | O. Hermann | English-Metric Dial Assembly | ||