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. 1937 . 1953-54 . Ѳ , 1955 . .
1956 " " . 1957 UNIVAS Ramington Rand. 1957 () . , . ""(US Navy) 1957-58 . . 1958 . R , , . 1959 . ' Gaddis rvard Business Review.
60- . R . Գ R/ S , . ѳ , . 1966 - . 70- , 볭 ' . 1977 , (1971 .), (1977-1979 .).
80- ( ) . , . . ' 㳿 , , , , , , . ֳ , . . 볭 . 1990 . 1991 , ͳ, ͳ . 90- : Ⳮ , , , , , .
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