There are 2 solutions. The longest is SEMAPHORE with 9 letters, and the shortest is BUZZER with 6 letters.
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Solutions are between 6 and 9 letters long.
| Clue | Answers | |
|---|---|---|
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| Old communications system | ||
| Communication means at sea | ||
| Communication by flags | ||
| Messaging by flags | ||
| Signalling equipment | ||