https://collections.monash.edu/nodes/view/66514
Specification - Sound Amplification System Great Hall | Monash Uni
Item date: 1968 | Item identifier: 1988/14 Item 27 | Series: MON325 | Read the full record details for Item: Specification - Sound Amplification System Great...
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https://samexplo.org/tag/sound-amplification/
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https://www.cochrane.org/evidence/CD013094_sound-therapy-using-amplification-devices-or-sound-generators-tinnitus
Sound therapy (using amplification devices or sound generators) for tinnitus | Cochrane
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