Summary

磁石式自動電話機用送話器使用標準

The Institute of Teregraph and Telephone Engineers of Japan 

Vol.1 No.7 pp.176-176

Publication Date:1917/07/01

Online ISSN:2188-2355

Print ISSN:0913-5693

Type of Manuscript:Miscellaneous notes

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Online ISSN:2188-2355