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公开(公告)号：US2512676A
公开(公告)日：1950-06-27
申请号：US79100647
申请日：1947-12-11
Applicant: FED TELECOMM LAB INC
Inventor： HIRAM RANSOM DAVID
IPC: H04Q11/04
CPC classification number: H04Q11/04
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