AU579727A - Improvements in or relating to sound amplifying horns for talking machines, loud speakers and other like sound reproducing apparatus
- Google Patents
Improvements in or relating to sound amplifying horns for talking machines, loud speakers and other like sound reproducing apparatus
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
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AU5797/27A
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Individual
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Individual
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Publication date
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Publication of AU579727ApublicationCriticalpatent/AU579727A/en
AU5797/27A1927-02-02Improvements in or relating to sound amplifying horns for talking machines, loud speakers and other like sound reproducing apparatus
ExpiredAU579727A
(en)
Improvements in or relating to acoustic amplifiers and radiators suitable for use with loud speaking telephonic receivers andother sound producing or reproducing apparatus
Improvements in or relating to acoustic amplifiers and radiators suitable for use with loud speaking telephonic receivers andother sound producing or reproducing apparatus