AU238278B2 - Improvements in or relating to apparatus for recording or reproducing acoustic vibrations provided witha variable acoustic impedance
- Google Patents
Improvements in or relating to apparatus for recording or reproducing acoustic vibrations provided witha variable acoustic impedance
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.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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Publication date
Application filed by Philips Gloeilampenfabrieken NVfiledCriticalPhilips Gloeilampenfabrieken NV
Application grantedgrantedCritical
Publication of AU238278B2publicationCriticalpatent/AU238278B2/en
Publication of AU5573959ApublicationCriticalpatent/AU5573959A/en
AU55739/59A1959-12-16Improvements in or relating to apparatus for recording or reproducing acoustic vibrations provided witha variable acoustic impedance
ExpiredAU238278B2
(en)