High frequency (violet ray) apparatus, 100 or 240v supply, by the Ideal Home Electrical Appliances Ltd. and by Roger, 45 Great Ormond Street, London, WC1, England, 1920-1950. High frequency (violet ray) apparatus 1920-1950
High frequency (violet ray) apparatus for supposed treatment of skin diseases, supplied by L.G. Hawkins of London, c.1930 High frequency violet ray actinotherapy apparatus
