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| All Patents of Type: depth micrometers | |||||
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| Number | Date | Patentee | Title | Type | |
| 877,846 | Jan. 28, 1908 | G. Koffskey | Micrometer attachment for Measuring Tools | depth micrometers | |
| 897,437 | Sep. 01, 1908 | W.H. Watson | Calipers | depth micrometers | |
| 1,526,418 | Feb. 17, 1925 | G. Gronner | Attachment for Depth Gauges | depth micrometers | |
| 1,922,758 | Aug. 15, 1933 | K. Christopherson | Micrometer Depth Gauge | depth micrometers | |