Stereoscopic viewer for x-ray plates or films by Alfred E. Dean and Company, Leigh Place, Brooke St., Holborn, London, 1920-1935 Stereoscopic viewer for x-ray plates or films by Alfred E. Dean and Company 1902-1935
'Emesay' unit with 'Radiometric technique director', combined power supply and control unit for thermionic x-ray tube, with hand-held timer, by the Medical Supply Association Ltd., 167-185 Gray's Inn Road, London, WC1, England, 1925-1935. "Emesay" unit 1925-1935