ontrollerEarlymachineswerecontrolledbymechanicalmeansusingcams,gears,,,butasmanufacturingtechniquesimprovedandplantchangeovertonewproductsbecamemoredesirableandnecessary,"bug"'sandearly1970'ontroller,,insomecases,,(thatis,on-offtypesignals),whiletoday',theycantypicallywithstandvibration,shock,elevatedtemperatures,,apabilitiesexpand,
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