I just love to watch trains and explore the history of Telephone Exchanges.
Tuesday, April 8, 2014
Did+all+ATT/Philps+Tel+5ESS-PBX+Host+Telephone+Switches+have+this+step+by+srep+switch+tone?
Did+all+ATT/Philps+Tel+5ESS-PBX+Host+Telephone+Switches+have+this+step+by+srep+switch+tone?
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