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| All Patents in class 324/71.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,005,887 | Jun. 25, 1935 | R.W. Carson | Grid Glow Micrometer | micrometers | |
| 2,319,516 | May 18, 1943 | C.H. Phelps | Gas flow indicator | ||