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公开(公告)号：US1257043A
公开(公告)日：1918-02-19
申请号：US1914866218
申请日：1914-10-12
Applicant: STODDARD CHARLES F
Inventor： STODDARD CHARLES F
CPC classification number: G10F5/04
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公开(公告)号：US1253744A
公开(公告)日：1918-01-15
申请号：US1909471471
申请日：1909-01-09
Applicant: STODDARD CHARLES F
Inventor： STODDARD CHARLES F
CPC classification number: G10F1/02
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