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公开(公告)号：US899236A
公开(公告)日：1908-09-22
申请号：US1908409647
申请日：1908-01-07
Applicant: BOETZ HEINRICH WILHELM
Inventor： BOETZ HEINRICH WILHELM
CPC classification number: B24B7/24 , Y10T29/4511 , Y10T29/4567
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公开(公告)号：US1204398A
公开(公告)日：1916-11-14
申请号：US1913778911
申请日：1913-07-14
Applicant: BOETZ HEINRICH WILHELM
Inventor： BOETZ HEINRICH WILHELM
CPC classification number: G11B5/3163
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