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User System Language. Bellcore, "Operations Technology Generic Requirements: User System Interface", TR-825.
Unix System Laboratories: the software subsidiary of AT&T, responsible for Unix System V and related software.
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USL(UNIX System Laboratories, Inc.) An AT&T subsidiary formed in 1990, responsible for developing and marketing Unix. In 1993, USL was acquired by Novell and merged into Novell's UNIX Systems Group (USG). See Univel.
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