The two measuring instruments described hereafter are new British designs developed to replace models marketed by the Karl Zeiss Company. They are both instruments of a type likely to be of great value in the aircraft industry.
(1940), "Two New British Precision Instruments: Details of Instruments Recently Developed for the Home and Foreign Market", Aircraft Engineering and Aerospace Technology, Vol. 12 No. 10, pp. 316-317. https://doi.org/10.1108/eb030705
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