Electronic controllers for use with a swimming tank; Apparatus and instruments for switching electricity; Electric or electronic control modules; Electronic assemblies; Electronic circuit boards; Electronic circuits; Electronic control apparatus; Electronic control apparatus for lighting; Electronic control apparatus for valves; Electronic control circuits; Electronic control systems; Electronic control units; Electronic controllers; Electronic measuring apparatus; Electronic remote control units (other than remote controls for toys); Electronic switching apparatus; Electronic system control apparatus; Electronic timing apparatus; Electronic timing control apparatus; Electronic timing control instruments; Printed electronic circuits for apparatus