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United States Patent 2675653
Publication Date:
04/20/1954
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Download PDF 2675653
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Primary Class:
451/342
Other Classes:
451/443
International Classes:
B24B45/00
;
B24D5/16
;
F16F15/32
;
F16F15/36
;
B24D5/00
;
F16F15/00