Laboratory apparatus and instruments; measuring or testing machines and instruments; telecommunication machines and apparatus; aerometers; alcoholmeters; capacity measures; counters; densimeters; densitometers; detectors; dosimeters; electro-dynamic apparatus for the remote control of signals; gas testing instruments; gasometers; hygrometers; measuring apparatus; electric measuring devices; measuring instruments; meters; apparatus and instruments for physics; precision balances; precision measuring apparatus; ressure measuring apparatus; quantity indicators; remote control apparatus; revolution counters; scales; viscosimeters; water level indicators; weighing apparatus and instruments