シーメンハルスケ電気会社自動交換方式の普及状態
The Institute of Teregraph and Telephone Engineers of Japan
Vol.6 No.3 pp.139-139
Publication Date:1922/03/01
Online ISSN:2188-2355
Print ISSN:0913-5693
Type of Manuscript:Miscellaneous notes
Category:
Keyword:
---
Full Text:PDF(54.2KB)>>
Summary: