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Conversion. Automobiles to 40 mm. anti-aircraft guns. With high-precision instruments, anti-aircraft gun barrels made in a former automobile plant are measured to a ten-thousandth of an inch. Chrysler Corporation, Highland Park, Detroit. Sourced from the Library of Congress.

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Conversion. Automobiles to 40 mm. anti-aircraft guns. With high-precision instruments, anti-aircraft gun barrels made in a former automobile plant are measured to a ten-thousandth of an inch. Chrysler Corporation, Highland Park, Detroit. Sourced from the Library of Congress.

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