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| Patents for Ludwig F. Perwas | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 3,426,436 | Feb. 11, 1969 | L.F. Perwas | Projected Measuring Surface Gage Blocks | |
 | 3,754,333 | Aug. 28, 1973 | L.F. Perwas | Scriber Setting Height gage | |