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Ships radio room clock face showing Radio "silence" periods on "Distress Frequencies Stock Photo - Alamy
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Vintage Ship Radio Room Wall Clock With Emergency Silence Period Markings. Great for Your Hamshack - Etsy UK
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Horological Meandering - This Smiths radio room watch is a cool novelty in my collection. It's based on a ship's radio room clock marked with three minute segments that designate periods of
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