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<p>[QUOTE=&quot;Shangas, post: 66796, member: 360&quot;]Dave is essentially correct. Trench whistles and police whistles were more or less the same thing. The only thing that made them different was the markings on the barrel. Other than that, they were almost exactly the same. </p><p><br /></p><p>Some trench whistles had arrow markings, some did not. I&#039;m not sure what the significance of that is...[/QUOTE]</p><p><br /></p>

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