73126354
May 25, 1977
Dec 5, 1978
AUDIO SPEAKER SYSTEMS COMPRISING AUDIO CABINETS, LOUDSPEAKERS, CROSS-OVER NETWORKS, AMPLIFIERS, PREAMPLIFIERS, DERECT CURRENT POWER SUPPLIES FOR SAID AMPLIFIERS AND PREAMPLIFIERS, AND ROTARY ACOUSTIC HORNS AND DRUMS
Electrical and Scientific Apparatus