Spindles of machine tools and metal working machines and parts thereof; devices and apparatus for the mechanical and/or hydraulic balancing of rotational bodies, namely, balancing or process monitoring system comprising balancing heads and operating software sold therewith for metal working machine tools and metal working machines; balancing heads or rings for use with machine tools and metal working machines and parts thereof; hydro-balancing apparatus and instruments used on grinding machines

Process monitoring and balancing electronics apparatus and instruments comprising of transceivers, receivers, data processors, power units and remote controls; data processors, in particular in the field of evaluation of acoustic emission of machines and machine tools; acoustic emission sensors; apparatus and instruments comprising of transceivers, receivers, data processors, power units and remote controls for automatically balancing machine spindles and/or visualizing and monitoring grinding processes on grinding machines; measuring, monitoring, signalling, checking or supervising and control apparatus and instruments, in particular sensors, revolution counters, in particular for machine tools and metal working machines; apparatus for recording, evaluating, receiving, transmitting and transferring of data, electronic current, sound and/or images; [ electronic data loggers for spindles; ] microprocessors; semiconductor power elements; integrated circuits; electric cables; computer software for process monitoring and balancing, namely, for process monitoring of the acoustic emission of machines and machine tools, for monitoring grinding processes on grinding machines and for balancing machine spindles and rotating elements of machines and machine tools; [ airborne transceivers; VHF/AM hand-held transceivers; transceivers for instrument panel installation, in particular in airplanes, helicopters, ground vehicles and ships; VHF/AM radio apparatus and parts thereof ]