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Signal generators
Wobbulators
Vibration generators, electrical
Time-code generators and readers
Time marker generators, electronic
Function generators for electro-acoustics
Generators, noise
Radar and television signal generators
Impedance transformers
Vibration pick-ups
Vibrometers and vibrographs
Vibration meters and analysers, electronic
Tuning forks, electrical
Active sound/vibration control systems for aircraft
White noise generating and test equipment
Testing and measuring equipment for radio, high fidelity (hi-fi) and television systems
Derived circuit multipliers
Attenuators, pad type
Ultraviolet (UV) meters
Intermodulation meters
Delay lines for acoustic surface waves
Impulse compression systems
Mains filters for electronic equipment
Phase comparators, electronic, oscilloscopic
Filters, quartz crystal and piezoelectric ceramic
Filters, acoustic surface wave
Surface acoustic wave pulse compression units
Suppressor filters, electric interference
Comparators, interference
Analysers, zeta potential
Sound analysers
Noise dosemeters
Reverberation time meters
Decibel meters
Sound level measuring equipment (phonometers)
Harmonic generators and analysers, electronic
Psophometers
Distortion factor meters
Flickermeters
Sound pressure measuring equipment
Nepermeters
Cut-off counters, electro-acoustics
