U.S. Congress, Joint Committee on the Economic Report, Subcommittee on Economic Stabilization. (1955). Automation and technological change: Hearings … 84th Congress, 1st session, October 14–28, 1955. Washington: U.S. Government Printing Office, pp. 29–37 · 1955-10-14
Read it with this context. The fragment drops its subject. The full sentence is 'Sometimes mechanization substitutes machinery for brainwork at the lower, routine levels. The electronic computer does this.' The point for M01 (the computer is classed as a form of mechanization, alongside the steam engine) needs the omitted words.
Why: Fresh-context audit (A1) judged that the quotation misleads when shown alone.