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Rotax Ltd, of Willesden Junction
1926 Lucas took over C. A. Vandervell and Co and Rotax Motor Accessories Co. The consideration of £707,217 for the purchase of Rotax was satisfied partly in cash but for the most part by the issue of Lucas £1 Ordinary shares. Lucas decided to concentrate manufacture of equipment for the heavier types of vehicles in C. A. Vandervell and Co and to develop Rotax for the manufacture of equipment for aircraft.
1933 Rotax Ltd was put into voluntary liquidation
1937 British Industries Fair Advert for Electrical Equipment for Modern Aircraft. Also Electrical Tools for Industrial and Garage Equipment: Drills, Polishers, Valve Refacers, Sanders and Grinders, Aircraft Electrical Equipment, Rotary Converters, Car Equipment, etc. (Engineering/Metals/Quarry, Roads and Mining/Transport Section - Stand No. Cb.601) 
1937 Lighting and starting equipment, magnetos and radio equipment. "Rotax" Aviation Equipment. 
1939 See Aircraft Industry Suppliers
From this time, Rotax Ltd, wholly-owned subsidiary of Lucas, was concerned principally with the production of equipment for aircraft.
Post WWII: Rotax's business declined by 90 percent compared with its wartime activities
1970 Closed the company's second largest factory at Willesden due to lack of orders from new projects for aircraft starters
1971 Became part of Lucas Aerospace
1978 One of the 2 factories at Hemel Hempstead was closed