Morse or Murray code.

Morse uses a morse key worked by a skilled operator who sends a series of dots and dashes over the wire. Another operator listens to the dots and dashes and writes the message down on paper.

Murray code is a five bit machine code, used by telexes and teleprinters.

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern --LEX--. That is, seven letter words with 3rd letter L and 4th letter E and 5th letter X. In alphabetical order, they are:

culexes

silexes

telexed

telexes

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern T--EXE-. That is, seven letter words with 1st letter T and 4th letter E and 5th letter X and 6th letter E. In alphabetical order, they are:

telexed

telexes

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern T-L-X-S. That is, seven letter words with 1st letter T and 3rd letter L and 5th letter X and 7th letter S. In alphabetical order, they are:

telexes

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern T-LEX--. That is, seven letter words with 1st letter T and 3rd letter L and 4th letter E and 5th letter X. In alphabetical order, they are:

telexed

telexes