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| All Patents in class 33/1PT | |||||
| Number | Date | Patentee | Title | Type | |
| 2,886,717 | May 12, 1959 | G.S. Walker, A.T. Sheperd, D.T. Williamson | Measuring Apparatus | measurement gauges | |
| 3,482,321 | Dec. 09, 1969 | G.E. Inshaw | Digital Micrometer | micrometers | |