Abstract: Provided is a toy building block which uses magnets, and which is a combination building block toy and teaching instrument with embedded magnets, wherein on each of the four edges of an upper frame (2) and lower frame (3), an inward-facing insertion aperture (6) is formed to connect internally to a central hollow portion (7), a magnetic ball (8) is inserted in the respective central hollow portions (7), and a projecting protrusion on the top and bottom of four pillars are inserted in the respective insertion apertures; and inward-facing projecting protrusions (21, 22, 23, 24), (25, 26, 27, 28) on an upper frame (20), lower frame (30), and pillars (40, 41, 42, 43), are respectively inserted in insertion grooves (23?, 24?, 27?, 28?) and (23a, 23b, 28a, 18b) on respective rails (9, 9?) (11, 11?), (9a, 9b, 11a, 11b) to assemble blocks (1) (1?) (1?) (1??), which are interconnected and used as a building block toy, or a random number of blocks (1) (10) (50) are stacked and assembled for observing the movement of a

Abstract: Provided is a toy building block which uses magnets, and which is a combination building block toy and teaching instrument with embedded magnets, wherein on each of the four edges of an upper frame (2) and lower frame (3), an inward-facing insertion aperture (6) is formed to connect internally to a central hollow portion (7), a magnetic ball (8) is inserted in the respective central hollow portions (7), and a projecting protrusion on the top and bottom of four pillars are inserted in the respective insertion apertures; and inward-facing projecting protrusions (21, 22, 23, 24), (25, 26, 27, 28) on an upper frame (20), lower frame (30), and pillars (40, 41, 42, 43), are respectively inserted in insertion grooves (23?, 24?, 27?, 28?) and (23a, 23b, 28a, 18b) on respective rails (9, 9?) (11, 11?), (9a, 9b, 11a, 11b) to assemble blocks (1) (1?) (1?) (1??), which are interconnected and used as a building block toy, or a random number of blocks (1) (10) (50) are stacked and assembled for observing the movement of a

Abstract: A horizontal drive circuit for a video display device includes a switching device for switching according to a horizontal oscillation frequency generated by a horizontal oscillator and a surge protector, and a method therefor. A driving transformer has a primary winding connected to the switching means and a secondary winding. The secondary winding provides an amplified current according to the status of the switching device. A diode serves as the surge protection connected between the switching device and the primary winding of the driving transformer.

Abstract: An apparatus for grounding a cable comprises a holder integrally formed at a predetermined portion of the cable for grounding the cable to the grounding member, a grounding plate integrally mounted to the holder for making contact with the grounding member at the same time that the cable is fixed to the grounding member by the holder, and a clamp by vertically protruding from the grounding plate so as to make contact with the ecdysis portion of the cable, thereby electrically connecting the cable to the grounding plate.