| All Patents in class 33/1R |
Patents 1 -
13
of 13
      |
| Number | Date | Patentee | Title | Type |
| 285,907 | Oct. 02, 1883 | P. Kennelly | Protractor | protractors |
| 407,515 | Jul. 23, 1889 | W.W. Duffield | Draftsman's Protractor | protractors |
| 594,692 | Nov. 30, 1897 | G. Henneberg | Spirit Level | levels |
| 865,350 | Sep. 10, 1907 | D. Berenberg | Measuring Apparatus | measuring apparatus |
| 1,555,792 | Sep. 29, 1925 | W. Souder | Dimensional Measuring Device | measuring apparatus |
| 1,571,261 | Feb. 02, 1926 | E.E. Ginter | Combined Compass and Protractor | compasses |
| 2,630,845 | Mar. 10, 1953 | W.A. Eschenberg | Work gauge for machine tools | tablesaw accessories |
| 2,699,610 | Jan. 18, 1955 | A. Brandt | Readjustable Thread Gauge | thread gages |
| 2,860,415 | Nov. 18, 1958 | E. Danilow | Layout Gage | measurement gauges |
| 2,947,083 | Aug. 02, 1960 | R.J. Rahn | Surface plate calibration | measuring tools |
| 3,087,246 | Apr. 30, 1963 | T.N. Busch | Determining reference plate for surface plate inspection | measuring tools |
| 3,276,135 | Oct. 04, 1966 | W.B. McCardell | Gear Tooth Checking System | gear measuring machines |
| 3,289,298 | Dec. 06, 1966 | R.D. Standridge | Calibration apparatus for surface plates | measuring tools |
