Mechanical computers -- See Calculators Here are entered works on present-day calculators as well as on calculators and mechanical computers of pre-1945 vintage. Works on modern electronic computers first developed after 1945 are entered under Computers.
Mechanical engineering Equipment and supplies -- See Also Electromechanical devices Here are entered works on electric generators, motors, transducers, sensing instruments, microphones, and similar devices, which convert electrical energy into mechanical energy, or the reverse, and which normally function as components of larger systems, e.g. electric power systems, information systems, control systems, etc.
Mechanical heart -- See Heart, Mechanical Here are entered works on extracorporeal pumping mechanisms that duplicate the function of the natural heart. Works on intracorporeal pumping mechanisms that duplicate the function of the natural heart are entered under Heart, Artificial.
Mechanical organs -- See Also Barrel organ Here are entered works on the small organ, used chiefly by street musicians, in which a barrel with pins or staples is activated by a hand crank. Works on the mechanical piano, used chiefly by street musicians, in which a pinned barrel or cylinder is activated by a hand crank are entered under Barrel piano. Works on the bowed string instrument, usually shaped like a viol, with a crank at the end opposite the pegbox are entered under Hurdy-gurdy.