Carton of 'Purgen-The New Aperient' tablets, London, England, 1901-1940 Materia Medica & Pharmacology 1901-1940
Sargrove sprayed circuit radio receiver production prototype, 1936-1948 Electronic Components 1936-1948
Experimental television receiver used by JL Baird in demonstration, made 1925-1926 Radio Communication 1925-1926