[Committee hearings] serial, 84th Congress. 15. Amending Clayton act by requiring prior notification of certain corporate mergers and for other purposes, hearings before antitrust subcommittee (subcommittee no. 5), 84th Congress, 2d session, on H. R. 6748, H. R. 7229, and H. R. 8332, Jan. 16-23, 1956.