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公开(公告)号：CA301964A
公开(公告)日：1930-07-08
申请号：CA301964D
Applicant: WICKWIRE SPENCER STEEL COMPANY
Inventor： WOODMAN FRANCIS NEWELL
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公开(公告)号：CA305953A
公开(公告)日：1930-11-18
申请号：CA305953D
Applicant: WICKWIRE SPENCER STEEL COMPANY
Inventor： WOODMAN FRANCIS NEWELL
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