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公开(公告)号：US633418A
公开(公告)日：1899-09-19
申请号：US1898676293
申请日：1898-04-04
Applicant: WILLMA POLLACK
Inventor： BELL FRANK M
CPC classification number: F16K15/063 , Y10T137/7613 , Y10T137/7842 , Y10T137/7846 , Y10T137/88054
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公开(公告)号：US662110A
公开(公告)日：1900-11-20
申请号：US1898699660
申请日：1898-12-19
Applicant: WILLMA POLLACK , BELL FRANK M
Inventor： BELL FRANK M
CPC classification number: G03B15/0442
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