| All Patents in class 451/9 |
Patents 1 -
10
of 23
      |
| Picture | Number | Date | Patentee | Title |
 | 521,976 | Jun. 26, 1894 | O.W. Am Ende | Thickness Gage for Paper making Machines |
 | 741,087 | Oct. 13, 1903 | C.B. Weidlog | Indicator for Boring Machines |
| | 1,182,861 | May 09, 1916 | H.K. Spencer | Metal Working Tool |
 | 1,263,142 | Apr. 16, 1918 | E. Stubbs | Micrometer Indicator for Tool Feeding Mechanisms |
| | 1,427,510 | Aug. 29, 1922 | W. Avery | Taper Attachment for Lathes |
| | 1,917,504 | Jul. 11, 1933 | F.W. Curtis | Cutter Grinder |
 | 1,952,965 | Mar. 27, 1934 | L.O. Beard | Instrument for measuring tappet-valve length while grinding valves and seats |
 | 2,167,189 | Jul. 25, 1939 | J. Verderber | Machine Tool |
| | 2,244,413 | Jun. 03, 1941 | J.B. Armitage | Precision Indicating Apparatus for Machine Tools |
| | 2,326,368 | Aug. 10, 1943 | C. Black, A. Kullman | Gear Forming Machine |
