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| All Patents in class 33/827 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,679,107 | May 25, 1954 | J.T. Gondek | Micrometer for Circular Size, Especially of Grooves | micrometers | |
| 3,101,551 | Aug. 27, 1963 | I.E. Bryant | Instrument for measuring linear dimensions | ||
| 3,222,790 | Dec. 14, 1965 | H. Meyer | Measuring Instrument | measurement gauges | |