Abstract: A magnetic head without an erase head, which includes a substantially U-shaped magnetic core with opposed end faces of a pair of legs forming a gap; and a magnetic material attached to one of the end faces to form a write read head with the other end face to write and read data from a recording medium. The magnetic material has a saturated flux density lower than that of the magnetic core. A read track width made by the magnetic material and the other end face is smaller than a write track width made by the opposed end faces.

Abstract: An apparatus for automatic identification and couting of a large number of returned or collected used linens at once by recognizing the shapes of markers that are opaque to X-rays and attached thereto. By numerically processing the shadow images of the markers projected onto an X-ray detector, a many kinds of linens can be identified and counted according to classification instantaneously.

Abstract: An apparatus for controlling operation of a recovery boiler for compensating a predetermined reference temperature of black liquor by a compensation value in accordance with a type of an injecting gun provided in the boiler, a compensation value set by the properties of the black liquor, a compensation value set by the temperature of charbed and a compensation value set by an air flow rate to the boiler representing the magnitude of boiler steam output or load to control the black liquor temperature supplied to the boiler.

Abstract: A fastener feeding apparatus includes a hopper for the bulk storage of fasteners, an oscillating scoop plate body for scooping up the fasteners from the hopper and letting them slide down onto a vibrating chute rail and a spring biased exclusion plate which moves back and forth above the chute rail to return any improperly oriented fasteners back into the hopper.

Abstract: Combustion of fuels each containing at least one combustible component, wherein, while the composition of each combustible component is known, the mixture ratio of only one combustible component is yet unknown, is automatically controlled by: measuring the flow rate of each fuel, the flow rate of air for the combustion, and the percentage proportion of residual oxygen in the combustion exhaust gas; introducing the values thus measured as input into a combustible component ratio detector comprising an operational circuit according to a combustion reaction formula thereby to automatically determine the unknown combustible mixture ratio; multiplying this mixture ratio by a flow rate signal corresponding to the same fuel; and utilizing the resulting product value for automatic control of the flow rate of each fuel and the combustion air.