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公开(公告)号：US1644370A
公开(公告)日：1927-10-04
申请号：US73596224
申请日：1924-09-04
Applicant: ALOIS GASCHLER
Inventor： ALOIS GASCHLER
IPC: G21G1/04
CPC classification number: G21G1/04 , G21Y2004/201
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