HOELLSTERN

Apparatus and instruments for recording, amplifying and reproducing sounds; sound processors, amplifiers, pre-amplifiers, power-amplifiers; buffers, distributors, signal generators and converters, all for use with audio signals, video signals or combinations of audio and video signals; video, audio and video and audio signal testing, monitoring, recording and reproducing and processing apparatus, namely, signal testers, monitors, signal generators, analyzers, video tape players, switchers, routers, time based correctors, synchronizers, serializes, desterilizes, recorders, distributors, mixers, modulators, demodulators, equalizers, color correctors, interfaces, oscillators and buffers