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| All Patents in class 33/544.4 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 69,954 | Oct. 15, 1867 | J. Richards | Standard Gauges | |
 | 157,779 | Dec. 15, 1874 | Q.S. Backus | Standard Gauges | |
| 2,038,602 | Apr. 28, 1936 | J.M. Redinger | Chuck | ||
 | 2,399,012 | Apr. 23, 1946 | H.F. Farrance | Measuring Device | |