![Specification for an acoustic coupler (IEC reference type) for calibration of earphones used in audiometry: [metric units] (BS4668. 1971)](https://www.ebooknetworking.net/books/noimage.jpg)
Specification for an acoustic coupler (IEC reference type) for calibration of earphones used in audiometry: [metric units] (BS4668. 1971)
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Book Details
Author(s)British Standards Institution
ISBN / ASIN0580062570
ISBN-139780580062575
MarketplaceUnited States 🇺🇸