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中华人民共和国国家标准 GB 2356-80 电话参考当量标准系统

Cover is for reference only
Corporate Authors: 邮电部; 邮电部传输部; 邮电部一所
Published: 技术标准出版社
Publication Dates: 1982
Call Number: T-652.1/5505.1-3
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