Abstract: The output voltage of an AM synchronous detector is compared with a reference potential level by a voltage comparator. A muting device connected with the output of the detector is controlled by a control circuit connected with the comparator. Through this control circuit, the detector output is immediately muted when the detector output level falls below the reference potential level, and the muting of the detector output is removed after a predetermined retardation when the detector output level exceeds the reference potential level.

Abstract: An exhaust manifold has dual liner structure constructed of an intermediate liner forming a chamber and a plurality of sleeves extending outwardly from the chamber and of an inner liner within the intermediate liner. The inner liner forms a reaction chamber within the chamber of the intermediate liner and a plurality of tubes extending outwardly from the reaction chamber and mounted within the sleeves, respectively. The tubes have inlet ports for connection to exhaust ports of an internal combustion engine. The reaction chamber is formed with a plurality of apertures opening to the chamber of the intermediate liner to let hot gases to flow into the chamber of the intermediate liner embracing the reaction chamber. The chamber of the intermediate liner is formed with an outlet port for connection to an exhaust pipe.

Abstract: A spare tire carrier utilizing an eccentric gear mechanism for hoisting a spare tire, in which said mechanism comprises means for restricting the movement of the external gear such that the internal gear driven by the external gear makes the pilgrim-step motion, whereby the mechanism may be positively prevented from the accidental reversal movement so as to prevent the drop of the spare tire.

Abstract: A combustion system and a method for operating same by passing a fuel-air mixture into an auxiliary combustion chamber and the same fuel-air mixture into a main combustion chamber with a portion of recirculated exhaust gas.

Abstract: An oscillation frequency control device which comprises a voltage control local oscillator; a generator for giving forth an output having a predetermined referential frequency; means for periodically generating a gate pulse whose time width is equal to an integral multiple of the period of an output signal from said generator; a gate circuit for permitting the passage of an output signal from the local oscillator only during the time width of said gate pulse, wherein, while the local oscillator continues oscillation at a desired frequency, the number k of waves running through the gate circuit is chosen to be equal to an integral multiple of the counting capacity or the scale type n of a counter; said n-scale counter counts signals which have traveled through the gate circuit in at least one cycle for each supply period of the gate pulse, starting with the prescribed count at which said counter is initially reset; a count obtained in the final cycle is changed into an analog signal; comparison is made between