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FORD FLTM BI 109-01:2011 VISUAL...
JIS K 2235:2022...
ITU-T Q.130 Special arrangements in case of failures in the sequence of signals
ITU-T Q.266 Blocking and unblocking sequences and control of quasi-associated signalling
ITU-T Q.462 Signalling between the outgoing international R2 register and an incoming R2 register in an international exchange
ITU-T Q.321 End-of-pulsing conditions; Register arrangements concerning ST signal
ITU-T Q.470 Termination of interregister signalling; At an incoming R2 register situated in a transit exchange
ITU-T Q.331 Test equipment for checking equipment and signals