Its Annual report, 1982:bt.p. (AT&T) p. 2 of cover (American Telephone and Telegraph Company); 1993: p. 1 (we plan to change the company's formal name from American Telephone and Telegraph Company to AT&T Corp. ... at our 1994 annual meeting)
AT&T technical journal, Mar./Apr. 1996: ed. p. (On Sept. 20, 1995 AT&T announced it would restructure into 3 separate independent companies ... AT&T ... Lucent Technologies ... NCR)