FACTORIES
FIRE ALARM EQUIPMENT
HISTORY OF ATM
LOUDSPEAKING
TELEPHONES
PROTOTYPES
SPREADSHEET of ATM
and STROWGER Co. TELEPHONES
SWITCHBOARDS,
PAX and PABX SYSTEMS
TELEPHONES
ATE - What ATM became
AEP - Portuguese subsidiary that produced ATM
telephones
BI&HC - British Insulated and Helsby
cables - Subsidiary
Please note that the number on ATM diagrams is just a diagram number.
They generally start with L53 and are 6 digits long.
Early ATM and BI&HC products start with prefix 'T', but most ATM
models are prefixed with 'L'.