Abstract: A direct-current motor includes a core including a plurality of teeth arranged in a circular disposition so as to define a plurality of slots, the teeth having distal ends and coil-winding sections respectively, coils wound on the coil-winding sections of the teeth respectively, and pole sections each of which is provided at a distal end side of the corresponding tooth and is circumferentially wider than the corresponding coil-winding section. In the motor, the teeth include first teeth having wider pole sections respectively and second teeth having pole sections narrower than the first teeth. Notches are formed in circumferential corners of the pole sections of the first teeth or members substantially integral with the pole sections of the first teeth respectively.

Abstract: A process for producing a leadframe for a semiconductor including (i) providing nickel or nickel-base alloy plating layers on both sides of a base material including an iron-base material or a copper-base material by electroplating or chemical plating so as to have a single layer thickness in the range of from 3 to 20 microns, (ii) applying a photoresist on both sides of the leadframe material produced in step (i) and forming a leadframe pattern by a patterning process and (iii) subjecting the leadframe material patterned in step (ii) to etching.

Abstract: A sealing agent injecting machine which comprises: a base having wheels, a driving system of said wheels installed in said base, a vessel containing sealing agent, connected with a nozzle and mounted on the base, and a pressure apparatus putting pressure into said vessel, is provided in the present invention. Sealing agent is injected into joint of covering materials such as floor covering by using said machine and said machine can rightly follow the joint by providing differential gear in the driving system.