Ear acoustical hearing aid

Ear defenders employing active noise control

Ear protection device for hard hat

Efficient multi-directional active vibration absorber assembly

Electric bell

Electric horn

Electric horn with means for controlling curvature of the...

Electric horn with solid state driver

Electro-acoustic signalling horns

Electro-acoustic sound diffuser

Electro-acoustic system

Electro-acoustical apparatus

Electro-acoustical apparatus

Electro-acoustical system

Electroacoustic calling device

Electroacoustic transducer

Electrode structure with constant velocity and predetermined...

Electrohydraulic pressure wave projectors

Electronic cancellation of d.c. motor noise

Electronic interrupter