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The obvious thing to consider would be how loud the whistle is. The loudest I've found is the Lifesystems survival whistle which, at 122dB, claims to be "the world's most powerful whistle." I'm no...
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The obvious thing to consider would be how loud the whistle is. The loudest I've found is the Lifesystems survival whistle which, at 122dB, claims to be "the world's most powerful whistle." I'm no...