pdf British Tones Popular

Published on 28 October 2009 665 downloads

British Tones.pdf

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TELEPHONY
A DETAILED EXPOSITION OF THE TELEPHONE SYSTEM OF THE BRITISH POST OFFICE
BY T. E. HERBERT, M.I.E.E. FORMER SUPERINTENDING ENGINEER, G.P.O.
AND
W. S. PROCTER, A.M.I.E.E. REGIONAL ENGINEER POST OFFICE ENGINEERING DEPT.

First Edition?? 1938
Reprinted? ? ?1938
"?????????????????1939
" ????????????????1940
"?????????????????1941
"?????????????????1943

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