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| All Patents in class 33/1BB | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,947,083 | Aug. 02, 1960 | R.J. Rahn | Surface plate calibration | measuring tools | |
| 3,087,246 | Apr. 30, 1963 | T.N. Busch | Determining reference plate for surface plate inspection | measuring tools | |