United States Patent 1140064

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Primary Class:
261/156
Other Classes:
251/80, 261/152, 261/144, 55/DIG.028, 261/DIG.053, 261/40, 261/70, 251/127, 48/189.400, 251/263, 261/DIG.052, 261/155, 123/545, 261/134, 137/543.150, 261/51, 261/DIG.055, 261/18.300, 251/78