pdf British Tones Popular

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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