BBN

ELECTRICAL AND ELECTRONIC ACOUSTIC AND COMMUNICATION APPARATUS INCLUDING MICROPHONES, ELECTRIC NETWORKS, INTEGRATING CIRCUITS, LIGHTING EQUIPMENT, SOUND RECORDING AND REPRODUCING EQUIPMENT, SIRENS, WHISTLES AND HORNS, VIBRATION DAMPING AND SOUND SILENCING APPARATUS, AMPLIFIERS FOR AUDIO AND RADIO FREQUENCIES

ELECTRICAL AND ELECTRONIC MEASUREMENT AND COMMUNICATION MEASUREMENT INSTRUMENTS NAMELY, SOUND LEVEL METERS, VIBRATION MEASURING AND CALIBATING INSTRUMENTS, ACOUSTIC WAVE GENERATORS, SOUND DETECTION SYSTEMS, TELEMETERING SYSTEMS, SOUND ATTENUATING AND VIBRATION DAMPING APPARATUS, SIGNAL MONITORING SYSTEMS INCLUDING CONSOLES FOR THE SAME, METERS, ANALOGUE ELECTRONIC CORRELATORS, AND ELECTRICAL AND ELECTRONIC COMPUTING EQUIPMENT