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Title: Audio frequency spectrometer type 2112 serial no [Go to resource]
Description: Audio frequency spectrometer type 2112 serial no. 107346, made in Denmark by Bruel & Kjaer, Copenhagen, range 22Hz to 45kHz License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1960-1979 Source: Science Museum Creator: Bruel and Kjaer (maker) Identifier: 1992-846 Go to resource More Like this...
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