Bruel & Kjaer level recorder for use with Peters Clinic Audiometer, for use in audiology experiments; acquired by the Department of Psychology, University of Warwick c 1975, and made in England, c 1960. Level recorder for audiology experiments, with components and instructions 1960-1985
Level Recorder, type 2305 with Logarithmic Potentiometer unit plus a second detached unit, from the Occupational Health Department of the London School of Hygiene and Tropical Medicine, by Bruel and Kjaer, Copenhagen, Denmark, 1970-1990. Level Recorder 1970-1990
