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| All Patents in class 33/DIG.002 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,259,472 | Oct. 21, 1941 | C. Johnson | Duplicator for machine tools | |
 | 2,372,427 | Mar. 27, 1945 | C. Johnson | Machine tool control | |
 | 2,590,151 | Mar. 25, 1952 | W.J. Bryant, H.H. Gates, T.H. Ljunggren | Bore gauge head | |
| 2,777,257 | Jan. 15, 1957 | A.M. Johnson | Hone with pressure actuated gage | ||
| 4,129,949 | Dec. 19, 1978 | R.P. Callaghan, Jr. | Height Gage | ||
| 5,347,723 | Sep. 20, 1994 | G.W. Russell | Air Bearing Control System | ||