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signal mirror: How to use a Double-Faced Signal Mirror
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signal mirror: Using a double-sided signal mirror
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signal mirror: ESM/1 Signal Mirror Instructions
signal mirror: GE ESM/1 Signal Mirror Instructions
signal mirror: Aiming Signal mirrors is hard
signal mirror: Soviet Signal Mirror
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signal mirror: Mayday Mirror and ESM/I
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signal mirror: USCG Signal Mirror Instructions Jan 1943