Abstract: An intake control device including a main intake passage provided with a throttle valve and a shut off valve disposed downstream of the throttle valve, and a bypass passage branched off from an upstream portion of the throttle valve and joined to the main intake passage at a portion downstream of the shut off valve. The amount of air through the bypass passage is controlled by an idle control valve. Owing to this arrangement, the residual gas within the downstream portion of the shut off valve is effectively removed by sufficient amount of scavenging air supplied by the bypass passage.

Abstract: In the ultrasonic apparatus being so constructed as to be capable of directing the oscillation of ultrasonic waves to the inner part of a container and the like, an ultrasonic apparatus characterized by the provision of an ultrasonic wave transfer preventive member to ensure the prevention of transfer of ultrasonic waves to unintended matters other than the object matter.

Abstract: An ultrasonic device for convergently radiating ultrasonic energy including a metallic ring vibrated to resonance by at least one electromechanical transducer fixed on the outer circumference of the ring, thereby to deliver high power ultrasonic waves from the inner circumference of the ring into the vacant center thereof.