Armstrong-Siddeley was a British company operating during the first half of the 20th century. It had two aspects: motor cars, Armstrong Siddeley Motors Ltd, and aero-engines and aircraft, via the Sir W G Armstrong Whitworth Company. The company was formed as a result of the merger of the interests of two Coventry-based companies, Armstrong-Whitworth and Siddeley-Deasy in 1919.
In 1909 J.D. Siddeley resigned from Wolseley and took over the Deasy Motor Co and the company became known as Siddeley-Deasy. In 1912 the cars used the slogan "As silent as the sphinx" and started to sport a Sphinx as a bonnet ornament.
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| Armstrong Siddeley automobiles at West Cumbria rally July 2009 | |
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