AU2151362A - Improvements relating to telephone exchange system ring-tripping arrangements and to like direct current responsive arrangements adapted to discriminate against alternating current
- Google Patents
Improvements relating to telephone exchange system ring-tripping arrangements and to like direct current responsive arrangements adapted to discriminate against alternating current
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Associated Electrical Industries Ltd
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Associated Electrical Industries Ltd
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Publication of AU2151362ApublicationCriticalpatent/AU2151362A/en
Publication of AU266550B2publicationCriticalpatent/AU266550B2/en
AU21513/62A1961-09-041962-08-28Improvements relating to telephone exchange system ring-tripping arrangements and to like direct current responsive arrangements adapted to discriminate against alternating current
ExpiredAU266550B2
(en)
Improvements relating to telephone exchange system ring-tripping arrangements and to like direct current responsive arrangements adapted to discriminate against alternating current
Improvements relating to telephone exchange system ring-tripping arrangements and to like direct current responsive arrangements adapted to discriminate against alternating current