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TYPES SN 54A LS1638, S N 54A LS1639, SN 74 A LS1 638 , S N 7 4 A LS 1 639 OCTAL BU S TRANSCEIVERS
D2661, DECEMBER 1982-REVISED DECEMBER 1983 S N 54A LS 1638, S N 54A LS 1639 S N 74A LS 1638, S N 74AL
