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British Patent 7146. "The Akroyd Oil Engine". Ray Hooley's – Ruston-Hornsby – Engine Pages. Archived from the original on 24 May 2011. Retrieved 2011-05-31.
British Patent 7146. "The Akroyd Oil Engine". Ray Hooley's – Ruston-Hornsby – Engine Pages. Archived from the original on 24 May 2011. Retrieved 2011-05-31.