What letter is _ . . _ in morse code?
If you was unable to signal by sound, what else could you use?
In what year was the Morse code first developed?
What letter is . . . in morse code?
Samuel ____ and Alfred Vail invented the Morse Code.
If you needed to send an SOS, which from the below would you communicate?
What letter is _ in morse code?
What would you use to communicate the letter A?