250 megohm oil-immersed wire-wound step-down resistor, part of continuously-pumped 250KV deep x-ray therapy equipment, by Metropolitan-Vickers Ltd., Manchester, England, 1938.
X-ray tube including diffusion pump unit, part of continuously-pumped deep x-ray therapy equipment, by Metropolitan-Vickers Ltd., Manchester, England, 1938.
Vacuum pump assembly, part of rectifier from continuously pumped 250kv deep x-ray therapy equipment, by Metropolitan-Vickers Ltd., Manchester, England, 1938.
Two spare ceramic tubes for rectifier unit of continuously pumped 250 kv deep x-ray therapy equipment, by Metropolitan-Vickers Ltd., Manchester, England, 1938.