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Ediswan Radio Valve Type ATP4 With Carton, by Ediswan, London, Mid 20th Century
Inventory Number: 22414
Number of documents: 3
Document Type: Miscellaneous Note
Document Heading: Inscription
Text:
"BVA [LOGO] / SIEMENS EDISON SWAN / LIMITED / 155 CHARING CROSS RD / LONDON W.C.2 / ENGLAND / AN A.E.I. COMPANY" printed on a side of carton exterior. "U301 / LIST PRICE / 17/6 / PLUS / PURCHASE TAX / RE-SALE PRICE / MAINTENANCE / This valve must be sold / retail at maker's list / price only. / MAZDA / MADE IN ENGLAND" printed on a side of carton exterior. "E / ATP4 / ZA5502" painted on exterior surface of bulb.
Document Type: Miscellaneous Note
Document Heading: Manufacturer Details - Ediswan
Text:
Ediswan, the trade name of the Edison and Swan United Electric Light Company Limited, made this valve for Marconi's Wireless Telegraph Co. Ltd. Joseph Swan, a Briton, and Thomas Edison, the famous American inventor jointly founded the company, as a result of the major court battle they fought over who was the original inventor of the electric light bulb. The company produced all the Marconi valves up to 1919, manufactured at them at their factory in Ponders End, North London.
Some Ediswan valves were marked 'Royal Ediswan' up to 1923.
Document Type: Miscellaneous Note
Document Heading: Historical Background - British Radio Valve Manufacturers' Association (BVA)
Text:
The British Radio Valve Manufacturers' Association (BVA) was established in July 1926 and was a registered trade union. It had been preceded by the Valve Manufacturers' Association, which had established a 'Memorandum of Sales Plan'. This agreement, which was signed by the seven major British valve manufacturers, secured a uniform practice in the sale of radio valves for broadcasting purposes in the UK. Practical examples included similar discounts and sales conditions, and were considered a form of restrictive practice. This association continued into the 1950s.
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