Abstract: Carriers each carrying a printed circuit board is conveyed successively through a soldering zone to dip each printed circuit board in molten solder contained in a vessel disposed below a space defined by two pairs of parallel front and rear rails. The four rails are engageable with four wheels of the carrier simultaneously and are vertically moveable so the printed circuit board carried on the carrier on the rails are contacted with the molten solder when the rails are in their lowered positions. Engaging means is provided for movement with one of the rails and for supporting engagement with the carrier. The engaging means is horizontally moveable so that the carrier engaged by the engaging means is horizontally moved forward and backward. By suitably moving the rails and the engaging means, the printed circuit board may alight on and leave from the surface of the molten solder in any desired tilted state.

Abstract: A water-closet with a heat-controlled sanitary bathing device including a heater for heating feed water to a predetermined temperature, a closet seat having a nozzle means for spurting heated water from the heater, a pump for pumping water to the heater and nozzle means, a water flow control valve means for controlling the flow rate of water to the heater, wherein a reflux passage is provided between the water flow control valve and the suction side of the pump to eliminate the variations in water pressure on the delivery side of the pump, which may lead to a trouble of the pump drive motor. The heater has a double vessel construction defining primary and secondary heating chambers each with electric heat control means to provide accurate control of the bathing water.