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AE Type 87CA Common Audible Signal Unit

Started by tptech302, February 16, 2013, 08:06:11 PM

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Babybearjs

#15
July 07, 2014, 01:20:34 AM
for anyone who's interested... it was the Stromberg-Carlson 1800 3 line phone that had the zener diode common audible unit. someone need to rebuild it and test it to see if it would work in todays telephone systems....
John
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