Early Diaphone Article

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Jim
Diaphone Owner
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Joined: Tue Jan 28, 2003 2:41 pm
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Location: Potter Valley, CA

Early Diaphone Article

Post by Jim » Thu Aug 01, 2019 12:05 pm

Nothing new except the early date on this and some good pics:

https://www.fireengineering.com/article ... .html#gref

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