Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"GERGER URIAH S" Page 1

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发明授权
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公开(公告)号：US2220883A

公开(公告)日：1940-11-12

申请号：US28336739

申请日：1939-07-08

Applicant: BELL TELEPHONE LABOR INC

Inventor： GERGER URIAH S , CURTIS AUSTEN M

IPC: H04B3/20 , H04M11/06

CPC classification number: H04M11/064 , H04B3/20 , H04M11/06

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