PL267662A1 - Electronic circuit arrangement for automatically disconnecting a telephone and/or its ringing circuit from subscriber's line
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Electronic circuit arrangement for automatically disconnecting a telephone and/or its ringing circuit from subscriber's line
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Priority to PL26766287ApriorityCriticalpatent/PL155318B1/en
Publication of PL267662A1publicationCriticalpatent/PL267662A1/en
Publication of PL155318B1publicationCriticalpatent/PL155318B1/en