In this task, you are given a context paragraph, a question based on that and corresponding answer of a question. Your task is to generate supporting fact/knowledge from context paragraph which helps in answering a given question.

Symbios Logic was a manufacturer of SCSI host adapter chipsets and disk array storage subsystems. It was originally established as a division of NCR Corporation in 1972, before NCR's takeover by AT&T Corporation in 1991. Question: The NCR Corporation (originally National Cash Register) was taken over by what company in 1991? Answer: AT&T Corporation

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
 It was originally established as a division of NCR Corporation in 1972, before NCRs takeover by ATT Corporation in 1991.