-
First practical wireless telegraphy systems based on Radio.
-
the first telecommunications is based on radio
-
the first telecommunications is based on radio
-
First North American transcontinental telephone calling
-
First North American transcontinental telephone calling
-
First North American transcontinental telephone calling
-
First commercial radio-telephone service, U.K.–U.S.
-
First commercial radio-telephone service, U.K.–U.S.
-
First experimental videophones
-
First experimental videophones
-
First commercial radio-telephone service, U.S.–Japan
-
First commercial radio-telephone service, U.S.–Japan
-
World's first public videophone network
-
World's first public videophone network
-
Limited capacity Mobile Telephone Service for automobiles
-
Limited capacity Mobile Telephone Service for automobiles
