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Portable tape recorder type L4B serial no Science Museum Group © The Board of Trustees of the Science Museum
Portable tape recorder type L4B serial no. H10200 by EMI Electronics Ltd., Hayes, Middlesex, England, reel-to-reel with ¼" tape on 4" diameter reels, dual speed 3.75 and 7.5 ips, used for noise measurement and analysis, 1967.