United States Patent 1174887
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223/109A, 224/183, 7/901, 273/456, 224/101, 335/302, 2/21, 224/217, 30/298, 294/65.500, 16/241, 206/818, 335/285, 24/303, 81/177.300, 131/186, 211/DIG.001