National security takeovers and technology preservation : hearings before the Subcommittee on Commerce, Consumer Protection, and Competitiveness of the Committee on Energy and Commerce, House of Representatives, One Hundred Second Congress, first session, including H.R. 2624, a bill to amend section 721 of the Defense Production Act of 1950 to clarify and strengthen its provisions pertaining to national security takeovers, February 26 and June 12, 1991.