| All Patents in class 33/1R |
Patents 1 -
10
of 13
      |
| Picture | Number | Date | Patentee | Title |
 | 285,907 | Oct. 02, 1883 | P. Kennelly | Protractor |
| | 407,515 | Jul. 23, 1889 | W.W. Duffield | Draftsman's Protractor |
 | 594,692 | Nov. 30, 1897 | G. Henneberg | Spirit Level |
| | 865,350 | Sep. 10, 1907 | D. Berenberg | Measuring Apparatus |
| | 1,555,792 | Sep. 29, 1925 | W. Souder | Dimensional Measuring Device |
| | 1,571,261 | Feb. 02, 1926 | E.E. Ginter | Combined Compass and Protractor |
 | 2,630,845 | Mar. 10, 1953 | W.A. Eschenberg | Work gauge for machine tools |
 | 2,699,610 | Jan. 18, 1955 | A. Brandt | Readjustable Thread Gauge |
 | 2,860,415 | Nov. 18, 1958 | E. Danilow | Layout Gage |
 | 2,947,083 | Aug. 02, 1960 | R.J. Rahn | Surface plate calibration |
