United States Patent 1616211

Publication Date:
02/01/1927
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Primary Class:
162/360.200
Other Classes:
162/194, 162/DIG.007, 162/296, 162/265, 162/136, 162/109, 162/357, 162/359.100, 162/286
International Classes:
D21F11/16; D21F11/00