Unit Automatic Exchange No.6
Made in 1934, possibly the last one to survive.
Unit Automatic Exchange No.13
The most common type of rural exchange.
A four exchange line and 35 extension PABX. Complete with switchboard.
PABX 3 project, to build a PABX made entirely from PABX3 parts.
A five exchange line and twenty extensions private automatic branch exchange.
A twenty exchange line and onehundred extension private automatic branch exchange.
A section of switchboards PMBX and PABX.
A section of telephones from the 60's, 70's and 80's
A section of subscribers equipment used in the 60's and 70's
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