Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AUTOMATISCHE FERNSPRECH ANLAGE
Original Assignee
AUTOMATISCHE FERNSPRECH ANLAGE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AUTOMATISCHE FERNSPRECH ANLAGEfiledCriticalAUTOMATISCHE FERNSPRECH ANLAGE
Application grantedgrantedCritical
Publication of FR621406ApublicationCriticalpatent/FR621406A/fr
H04M3/08—Indicating faults in circuits or apparatus
H04M3/14—Signalling existence of persistent "off-hook" condition
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04M—TELEPHONIC COMMUNICATION
H04M3/00—Automatic or semi-automatic exchanges
H04M3/08—Indicating faults in circuits or apparatus
H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Monitoring And Testing Of Exchanges
(AREA)
FR621406D1925-05-251926-04-27Dispositif d'avertissement pour installations de téléphones automatiques
ExpiredFR621406A
(fr)