AC telegraph circuit

AC telegraph system

acoustic telegraph

aerial telegraph conductor

aggregate telegraph input signal

aggregate telegraph speed

alphabet telegraph

alphabetic telegraph

alphabetic telegraph signal

AM voice frequency carrier telegraph systme

American Telephone and Telegraph Company

American Telephone and Telegraph Company AT&T

amplitude modulation (AM) telegraph

amplitude modulation carrier telegraph

anchor telegraph

audio frequency telegraph

audio-frequency telegraph

autmatic-telegraph

autographic telegraph

automatic ARQ error correcting telegraph system