The first hint to crack the puzzle "Signals used before digital ones came along" is:

It is a word which contains 6 letters

The second hint to crack the puzzle "Signals used before digital ones came along" is:

It starts with letter a

The third hint to crack the puzzle "Signals used before digital ones came along" is:

It ends with letter g

Looking for extra hints for the puzzle "Signals used before digital ones came along"

Click on any empty tile to reveal a letter

The answer for the puzzle "Signals used before digital ones came along" is: