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公开(公告)号:US1995923A
公开(公告)日:1935-03-26
申请号:US71515834
申请日:1934-03-12
Applicant: SMITH CORP A O
Inventor: HOYT SAMUEL L , ARCHER ROBERT S
公开(公告)号:US1995923A
公开(公告)日:1935-03-26
申请号:US71515834
申请日:1934-03-12
Applicant: SMITH CORP A O
Inventor: HOYT SAMUEL L , ARCHER ROBERT S