Abstract: A seat apparatus includes: a seat cushion provided in a vehicle; a seat back pivotably joined to the seat cushion, the seat back capable of being folded forward so as to be superposed on the seat cushion; a seat storage unit in which the seat cushion and the seat back are stored in a folded state; and a headrest attached to the seat back via a pivotable member, the headrest capable of being stored in a clearance defined between a back supporting surface of the seat back and a sitting surface of the seat cushion when the seat cushion and the seat back are folded.

Abstract: A detector detects the variation of resistance between fingers of a human's hands which varies in response to his mental condition. When the mental condition is varied and the resistance between fingers is changed, the detector detects such resistance variation, which is then converted into an electric signal. This electric signal drive light emitting diodes (LEDs) or the like so that the user of this detector can realize his mental condition by watching the light. By further providing a lamp, an image film and a lens, the user can watch the image on the image film when light radiated from the lamp projects such image onto the lens. This detector is useful for meditation and mental training because the user can realize the variation of his mental condition by watching the light or image.

Abstract: An automatic linearity correcting circuit comprises a junction-type active element, a dual gate MOSFET, an AGC circuit to keep output signal from the dual gate MOSFET at a predetermined level and a correcting voltage applying circuit to convert AGC voltage to a voltage most suitable for linearity correction, so that output signal from the junction-type active element is applied to one of gates of the dual gate MOSFET, and correcting voltage from the correcting voltage applying circuit is applied to the other gate of the MOSFET.

Abstract: AGC system for a television receiver having a keyed AGC circuit, a peak or average AGC circuit and a switching circuit between a video signal intermediate frequency amplifier circuit and an video signal detection circuit, wherein automatic gain control (AGC) for video signals is effected by the keyed AGC circuit, which is commuted by using the switching circuit after having had the peak or average AGC circuit operated at the switch-on moment of the power supply.

Abstract: In arc furnace steelmaking, oxygen gas is blown in the molten steel at melting period and/or oxidizing period so as to decrease the carbon content therein to 0.20% or less, preferably 0.15% or less, and subsequently, carbonaceous material is blown in the furnace by utilizing flow of a carrier gas.A higher melting yield and a smaller amount of slag production are achieved with an improved productivity and lower energy consumption.