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GB738897A
|
|
Arrangement for use in the metering and recording of telephone calls
|
|
GB717247A
|
|
Improvements in telephone coin collectors
|
|
US2667255A
|
|
Coin collecting device
|
|
GB680625A
|
|
Improvements in arrangements in metering circuits of remote signalling systems
|
|
US2596308A
|
|
Metering system for telephony
|
|
US2623950A
|
|
Deposit-controlled timing system for telephony
|
|
GB672772A
|
|
Improvements in and relating to electrical systems for automatically registering time and date
|
|
GB630333A
|
|
Improvements in or relating to electrical plug and socket arrangements, particularlyfor use in contact panels in telephone installations
|
|
GB605422A
|
|
Improvements in polarised relays
|
|
GB625893A
|
|
Improvements relating to teleprinter exchanges
|
|
GB580001A
|
|
Improvements in terminal members and terminal banks for electric connecting systems
|
|
US2253136A
|
|
Electric connecting panel
|
|
GB580920A
|
|
Improvements in and relating to terminal banks and distributing frames for automatic telephone exchange and like systems
|
|
CA526686A
|
|
Coin collecting devices
|
