Abstract: A heating system for heat treating a continuous sheet-like material includes an input end and an output end and a path defined therebetween that extends between the input and output ends for the material to be treated. At least one section of the heating system includes an upper movable heater and a lower stationary heater disposed on confrontingly opposite sides of the material path. A heater lifter is connected to the movable upper heater for operatively displacing the upper heater between a first position for imparting a curing type of heat treatment and a second position for imparting an annealing type of heat treatment to the continuous sheet material as it is advanced through the heating system.

Abstract: A semiconductor commutator which is constructed by joining a semiconductor region of the first conductivity type and a semiconductor region of the second conductivity type, wherein there is provided a grain boundary which is located near a junction surface of the semiconductor region of the first conductivity type and the semiconductor region of the second conductivity type so as not to cross said junction surface.