Monaghan pulmonary function analyser (electronic spirometer) model 403, by Hospal Medical Corporation, Colorado, USA, 1977 Monaghan pulmonary function analyser (electronic spirometer) model 403 1977
Audiometer, model 1701, by Grason-Stadler, Littleton, New Hampshire, U.S.A., 1970-1980 Audiometer, model 1701
Audiometer, model 1715, by Grason-Stadler, Littleton, New Hampshire, U.S.A., 1970-1980 Audiometer, model 1715 1970-1980