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| All Patents in class 33/83 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 802,470 | Oct. 24, 1905 | M. Picard | Measuring Instrument Designed to Ascertain the Depth of Recesses or Cavities Formed in Solid Bodies | ||
| 1,136,648 | Apr. 20, 1915 | W.H. Bristol | Measuring Instrument | ||
| 1,338,670 | May 04, 1920 | E.T. Bishop, W. Bolton | Means for Measuring the Pitch of Screws and the Like | ||