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| All Patents in class 324/545 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 556,646 | Mar. 17, 1896 | C.F. Scott, C.E. Skinner | Device for detecting short circuits | |
 | 1,330,271 | Feb. 10, 1920 | E.P. Lee | Growler | |
| 1,759,479 | May 20, 1930 | P.E. Chapman | Testing instrument | ||
 | 1,924,913 | Aug. 29, 1933 | P.E. Chapman, C.L. Chittenden | Growler type testing device | |
 | 2,622,128 | Dec. 16, 1952 | P.E. Chapman | Growler type testing device | |
 | 3,483,470 | Dec. 09, 1969 | A.N. Tsergas | Apparatus for testing armatures for coil condition, shorts or leakage | |