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| All Patents in class 33/501.4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 211,975 | Feb. 04, 1879 | G.W. Dickinson | Micrometer Screw Gage | micrometers | |
| 527,651 | Oct. 16, 1894 | J. Bath | Calipers | measurement gauges | |
| 675,875 | Jun. 04, 1901 | F. Ullmer | Micrometer | indicating calipers | |
| 903,484 | Nov. 10, 1908 | S. Kenley, A.S. Lane | Measuring Instrument | measurement gauges | |
| 1,257,483 | Feb. 26, 1918 | K.J. Almfelt, A. Hart | Measuring Indicator or Gauge | measurement gauges | |
| 1,507,272 | Sep. 02, 1924 | E. Buckingham | Internal Expansion Gauge | measurement gauges | |
| 1,561,630 | Nov. 17, 1925 | R.A. Wilson | Micrometer Calipers | micrometers | |
| 1,631,019 | May 31, 1927 | P.J. Darlington | Micrometer Calipers | micrometers | |
| 1,652,854 | Dec. 13, 1927 | P.J. Darlington | Micrometer Caliper | micrometers | |
| 1,664,583 | Apr. 03, 1928 | E.O. Wheelock | Snap Gage | special purpose gauges | |
| 1,740,695 | Dec. 24, 1929 | C.E. Johansson | Gauge | inside micrometers | |
| 1,810,710 | Jun. 16, 1931 | C.E. Johansson | Gauge | inside micrometers | |
| 1,821,398 | Sep. 01, 1931 | R.J. Simpson | Micrometer Calipers | micrometers | |
| 1,892,969 | Jan. 03, 1933 | J.N. Schneider | Indicator Snap Gauge | measurement gauges | |
| 1,972,124 | Sep. 04, 1934 | A.H. Emery, E.H. Aldeborgh | Indicating Limit Plug Gauge | plug gauges | |