| All Patents in class 33/561.1 |
Patents 1 -
7
of 7
      |
| Picture | Number | Date | Patentee | Title |
 | 14,984 | May 27, 1856 | E.T. Miller | Hatmaker's caliper for measuring heads |
 | 66,946 | Jul. 23, 1867 | A.M. Miller, J. Burt | Improvement in Trial Squares |
| | 255,130 | Mar. 21, 1882 | H.C. Barker | Contour Gage and Tool |
| | 362,724 | May 10, 1887 | F.W. Davenport | Outline-Transfer Tool |
| | 941,297 | Nov. 23, 1909 | R. Barthelmes | Instrument for Measuring the Cross Section of Rail, &c. |
 | 1,364,534 | Jan. 04, 1921 | F.L. Walter | Gage |
 | 2,791,836 | May 14, 1957 | H.J. Gerber | Instrument for measuring the slope of a curve at a selected point thereon |
