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ntro duction<br >It is difficult to imagine present-day life without<br >the convenience of a telephone. It has become<br >a necessity - the carrier of every kind of<br >communication， from family news to crucial<br >business deals， from the take-away pizza order to<br >President s message to his astronauts.<br >Ericofon (~()0<br >L) i~ s，w~H. 1954<br >electric telegraph - and we still refer to the poles that<br >Siem<br >"IS 282<br >196fl，~<br >te<br >G<br >Despite its crudity<br >an absolute sen:<br >Exhibition at Ph<br >exclaimed， My G<br > Its obvious po<br >investment， and n<br >Bell s patents， in~<br >h， ll s "(;allov~s<br > 1 ~ 76<br >
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