Microscopes; Theodolites; Verniers; Carpenters' rules; Current rectifiers; Digital multimeters; Electric junction boxes; Electromagnetic coils; Electronic plotters; Fuse wire; Instruments for measuring length; Level measuring machines; Marking gauges for joinery purposes; Measuring rules; Pantographs being electric current collectors; Power amplifiers; Pressure measuring apparatus; Relays, electric; Square rulers for measuring; Tool measuring instruments