Abstract: In a speaker device 10 having: a magnetic circuit 13 including a magnet 14 and a yoke 11; a voice coil 16 which is placed in a magnetic gap 12 of the magnetic circuit 13; and a diaphragm 17 which is vibrating available in a state where the diaphragm is coupled with the voice coil 16, a peripheral edge of the diaphragm 17 being fixed to a housing 20, a damper holder 30 is disposed in a portion where a damper 27 is attached to the housing 20. The damper holder 30 is in point contact with the housing 20 via three or more projections 31 which are disposed on one of the damper holder 30 and the housing 20. Preferably, the damper holder 30 is made of a hybrid material of a resin (polypropylene) and tungsten, and has a specific gravity of 10.0 or larger.

Abstract: A digital protective relay system is capable of making sampling timing the same among plural protective relay device which operate independent from each other by using a signal from a GPS satellite. The sampling timing is made the same regardless of the time lag from which it is sent downstream with the concomitant transmission delay time in the case of data communications, or regardless of the time lag from which it is sent upstream.

Abstract: A speaker capable to playback in wide frequency range by means of reducing peak values of amplitude of resonance frequencies in frequency characteristics is provided by means of differing a radius of curvature R1 of an inner diaphragm 10a and a radius of curvature R2 of an outer diaphragm 10b to differ resonance frequencies of the inner diaphragm 10a and the outer diaphragm 10b. Furthermore, by means of equalizing an area S1 of the inner diaphragm 10a and an area S2 of the outer diaphragm 10b, sound pressure levels of the inner and outer diaphragms 10a, 10b are equalized with each other.

Abstract: A digital protective relay system is capable of making sampling timing the same among plural protective relay device which operate independent from each other by using a signal from a GPS satellite. The sampling timing is made the same regardless of the time lag from which it is sent downstream with the concomitant transmission delay time in the case of data communications, or regardless of the time lag from which it is sent upstream.

Abstract: A bored thrust bearing having a bearing face formed in series with tapered lands for forming a thrust load-carrying oil film, each tapered land being formed with a foot surface having a given sloping angle (.beta.) and an upper surface having a gentle sloping angle (.alpha.) less than the given sloping angle, the foot surface and the upper surface having therebetween a rounded boundary.

Abstract: A bored thrust bearing having a bearing face formed in series with tapered lands for forming a thrust load-carrying oil film, each tapered land being formed with a foot surface having a given sloping angle (.beta.) and an upper surface having a gentle sloping angle (.alpha.) less than the given sloping angle, the foot surface and the upper surface having therebetween a rounded boundary.