The provision of a common battery telephone exchange
by G.F. Greenham
Bok Engelsk 1918
| Utgitt | [London] : Institution of Post Office Electrical Engineers , 1918
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|---|---|
| Omfang | 60 s. : ill.
|
| Opplysninger | A paper read before the London Centre of the Institution on 19th March, 1918
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| Emner |
