THE firm of D. Napier & Son, Ltd., are probably best known as the manufacturers of the Lion series of aero‐engines. It is, however, interesting to record that they are the oldest engineering firm engaged in the aero‐engine industry, having been established as long ago as 1808.
(1933), "Napier Machine‐Shop Equipment: A Description of the Machines Used at Acton on Lion, Javelin and Rapier Engines", Aircraft Engineering and Aerospace Technology, Vol. 5 No. 12, pp. 293-296. https://doi.org/10.1108/eb029752
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