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United States Patent
2,137,928
Issue Date:
November 22, 1938
Current U.S. Class:
222/59
; 137/904; 222/14; 222/651; 68/12.17; 68/12.18; 68/12.23
Current International Class:
D06F 39/02 (20060101); D06F 33/02 (20060101)
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