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steam whistles

I cannot seem to get any of these to work. Can anyone tell me the secret? AC or DC? Optimum voltage? Is there some sort of "on-off" switch?

Thanks.

 

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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