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accuracy adjustable amplifier analogue computer applications assembly auto automatic control automation British circuit components control system conveyor cycle cylinder data processing developed devices differential analyser drilling drive drum electrical electronic Engineering equipment exhibition feed flow frequency function furnace gauge gear germanium handling heat hydraulic indicator industry input installed instruments load London machine tool magnetic magnetic amplifier magnetic drum magnetic tape manager manual manufacture matic measuring mechanical ment meter methods mill motor mounted operation output p-n junction panel photocell plant plate pneumatic position potentiometer pressure printed problem production programme pulse punched card punched tape range recording relay roller rotating Selsyn servo shaft shown in Fig signal solenoid spacistor speed spindle standard station storage suitable supply switch technical techniques teleprinter temperature thyratron timers tion transfer transistors tube unit valve variable voltage welding