Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"BROWN CLAYTON B" Page 1

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发明授权
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Title translation: 卡片翻译

公开(公告)号：US2774821A

公开(公告)日：1956-12-18

申请号：US28637452

申请日：1952-05-06

Applicant: BELL TELEPHONE LABOR INC

Inventor： BROWN CLAYTON B , HAMPTON LEON N , THIEL JR FELIX A

IPC: G06K21/04

CPC classification number: G06K21/04

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