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United States Patent
3,371,153
Issue Date:
February 27, 1968
Current U.S. Class:
348/381
; 313/473; 348/741
Current International Class:
H01J 9/22 (20060101); H01J 29/18 (20060101); H01J 29/32 (20060101); H01J 29/26 (20060101)
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