Apparatus for pulse train measurement

Apparatus for simultaneous generation of key at two locations

Apparatus for the direct connection of ancillary equipment to a

Apparatus for the identification of feedback tapes in a shift re

Apparatus for the time division multiplex transmission of binary

Apparatus for the transmission end-enciphering and reception end

Arrangement for ciphering and deciphering of information

Arrangement for regenerating start-stop signals and dial pulses

Arrangement for scanning a disc-shaped type carrier

Arrangement for simultaneous two-way data transmission over two-

Arrangement for transmitting digital data and synchronizing info

Array device for data scrambling

Asynchronous addressable multiplex system

Asynchronous digital repeater

Asynchronous PCM common decoding apparatus

Asynchronous quadriphase communications system and method

Audio transmission protection apparatus

Authentication system between a card reader and a pay card excha

Authenticator code generator

Authenticator device for precluding compensating text modificati