United States Patent 0654647

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Primary Class:
134/25.100
Other Classes:
68/183, 8/149.100, 134/102.200, 241/28, 134/30, 68/207, 134/36, 209/159, 134/94.100, 8/156, 8/137, 68/181R
International Classes:
B03B5/62; B03B5/00