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公开(公告)号：US1352611A
公开(公告)日：1920-09-14
申请号：US1914833270
申请日：1914-04-20
Applicant: EASTERN MFG COMPANY
Inventor： LADD FRANK C , NEAL FRANKLIN G
IPC: D21G1/00
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公开(公告)号：US1641173A
公开(公告)日：1927-09-06
申请号：US37453120
申请日：1920-04-17
Applicant: EASTERN MFG COMPANY
Inventor： LADD FRANK C , NEAL FRANKLIN G
IPC: D21G1/00
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