Invention Grant
- Patent Title: Magnetic recording system for call data in automatic telephony
- Patent Title (中): 用于自动电话呼叫数据的磁记录系统
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Application No.: US77209147Application Date: 1947-09-04
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Publication No.: US2594495APublication Date: 1952-04-29
- Inventor: RETALLACK JOHN B
- Applicant: BELL TELEPHONE LABOR INC
- Assignee: Nokia Bell Labs
- Current Assignee: Nokia Bell Labs
- Priority: US77209147 1947-09-04
- Main IPC: H04M15/38
- IPC: H04M15/38
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