Cassette changer, for use in diagnosis of heart diseases, by A. Collis, from Dr. K. Keele, English, 1940 to 1950 Cassette changer 1940-1950
Cassette changer, for use in diagnosis of heart diseases, by A. Collis, from Dr. K. Keele, English, 1940 to 1950 Cassette changer 1940-1950
Two glass plates showing a cassette changer used in diagnosis of heart diseases, in a brown envelope Two glass plates showing a cassette changer used in diagnosis of heart diseases 1940-1950