Scientific, surveying, optical, weighing, measuring, signalling, checking, supervision and recording apparatus and instruments, in particular equipment, apparatus and instruments for level measuring, flow measuring, temperature measuring and pressure measuring, as well as current/pneumatic transformers and valve setting regulators, all aformentioned also for land, air and sea vehicles for the purpose of measuring and monitoring the consumption of liquids, in particular of fuel and lubricant; gas mixer and ellipsographs; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity.;