MS20067A, MILITARY STANDARD: KEY, MACHINE, SQUARE IN CROSS-SECTION, ONE END SQUARE, OTHER END ROUND (16 NOV 1964) [SUPERSEDED BY NASM20067]
MS20067A, MILITARY STANDARD: KEY, MACHINE, SQUARE IN CROSS-SECTION, ONE END SQUARE, OTHER END ROUND (16 NOV 1964) [SUPERSEDED BY NASM20067].