Electrical apparatus included in this class inclusive of transducers, detectors, amplifiers, integrators, oscillators, solid state circuits, cables, stroboscope light devices and component parts thereof; apparatus for observing and measuring mechanical vibration including support stands; vibration pickup devices; devices for metering, indicating and recording mechanical vibrations and parts thereof included in this class

Vibration investigation and measurement services for continu ous and periodic monitoring of unbalance in rotating bodies and for correction of such unbalance