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Signal
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==Gallery== <gallery widths="150px" heights="150px" perrow="4"> Signalman sends semaphore message from Pearl Harbor Control Tower c1960.jpg|A signalman sends a semaphore message from a Pearl Harbor Control Tower, {{circa|1960}}. Finnish distant signal displaying Expect Stop.jpg|A Finnish distant signal at the western approach to [[Muhos]] station is displaying ''Expect Stop''. Hailing a cab.jpg|A woman hailing a cab is sending a signal of availability to be picked up. Signal flare during a rescue training mission.jpg|A [[flare]] is a common means to signal during dark or smoke-filled conditions. </gallery>
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