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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
Appareil auxiliaire pour appareil electrique de coupure a boitier moule et appareil electrique de coupure a boitier moule comprenant ledit appareil auxiliaire