LU75726A1LU75726ALU75726ALU75726A1LU 75726 A1LU75726 A1LU 75726A1LU 75726 ALU75726 ALU 75726ALU 75726 ALU75726 ALU 75726ALU 75726 A1LU75726 A1LU 75726A1
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LU
Luxembourg
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LU75726A
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Publication of LU75726A1publicationCriticalpatent/LU75726A1/xx
H04M19/00—Current supply arrangements for telephone systems
H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations