VOICE-FREQUENCY TELEGRAPH SYSTEM WT-1000D

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作者：

REGER, W

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来源：

SIEMENS REVIEW | 1978年 / 45卷 / 09期

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中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

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页码：407 / 409

页数：3

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