Abacuses; accounting machines; accumulators, electric; accumulators, electric, for vehicles; acid hydrometers; acidimeters for batteries; acoustic conduits; acoustic couplers; acoustic sound alarms; actinometers; adding machines; aerometers; air analysis apparatus; electric door alarm bells; burglar and fire alarms; measuring apparatus, namely, meters for measuring alcohol; alidades; altimeters; ammeters; amplifiers; amplifying tubes, namely, audio amplifiers; anemometers; video disks and vid...