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| All Patents of Type: depth gauges | |||||
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| Number | Date | Patentee | Title | Type | |
| 802,470 | Oct. 24, 1905 | M. Picard | Measuring Instrument Designed to Ascertain the Depth of Recesses or Cavities Formed in Solid Bodies | depth gauges | |
| 1,248,340 | Nov. 27, 1917 | F.B. Kinney | Depth Gage | depth gauges | |
| 2,190,899 | Feb. 20, 1940 | F.J. Vierling | Gauge | depth gauges | |