The firm of A. C. Wickman Ltd. has recently put on the market a number of special instruments for the accurate measurement of tools and gauges. Some of these instruments are suitable for production use where exceptionally fine limits are required. The following article describes a few of the instruments offered by this firm. Another instrument in the same class, for which this firm are agents, was fully described in AIRCRAFT ENGINEERING, June, 1941, p. 175.
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