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United States Patent 3539188
Inventors:
Salverda, Robert E.
Publication Date:
11/10/1970
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Download PDF 3539188
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Assignee:
Robert, Salverda E.
Primary Class:
273/110
Other Classes:
273/113
International Classes:
A63F7/00
;
A63F7/38
; A63F7/16
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