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Publication of AU2562271ApublicationCriticalpatent/AU2562271A/en
Publication of AU459056B2publicationCriticalpatent/AU459056B2/en
AU25622/71A1970-02-181971-02-18Switching device for telephone instruments adapted to alternately be used as lowspeaking and loudspeaking telephones
ExpiredAU459056B2
(en)