LOCKHEED hydraulic controls, manufactured by the Automotive Products Co., Ltd., of Leamington Spa, are now used extensively for the hydraulic operation of undercarriages, flaps, bomb hoists, doors, etc.
(1938), "Hydraulic Controls: A Complete System for Operating Both Main and Auxiliary Services", Aircraft Engineering and Aerospace Technology, Vol. 10 No. 6, pp. 189-191. https://doi.org/10.1108/eb030329
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