Abstract: Disposed in front of the lastly stopping center reel 12B of three reels 12A, 12B, and 12C is a cover member 16 which is movable between the position of a display apparatus 108a and a shelter position thereabove and is formed with a picture Fo. When the reel 12B is stopped with its picture Fo placed at the display window 108a, in the case where each of the other two reels 12A and 12C is stopped with the picture Fo placed at the display window 108a (in the case of a jackpot), the cover member 16 is moved from the shelter position to the position of the display window 108a and minutely vibrates at the position of the display window 108a before being stopped, whereby the picture Fo' formed in the cover member 16 appears in an unusual mode. Accordingly, the player's impression when winning a jackpot in a game machine equipped with thus configured reel apparatus can be fully enhanced, thus allowing enjoyability thereof to improve.

Abstract: A high-performance, inexpensive, small-size, and light-weight wide-angle zoom lens suitable for a TV camera is obtained, which comprises, successively from the object side, four groups having positive, negative, negative, and positive refracting powers, respectively, exhibits a half angle of view of about 40 degrees, and favorably corrects aberration. Successively disposed from the object side are a first lens group G.sub.1 having a positive refracting power functioning as a focusing part and comprising six sheets of lenses composed of a concave meniscus lens having a convex face directed onto the object side, a biconcave lens, a biconvex lens, a cemented lens made of concave and convex lenses, and a convex meniscus lens having a convex face directed onto the object side; a second lens group G.sub.2 functioning as a power-changing part and having a negative refracting power; a third lens group G.sub.

Abstract: An endoscope which allows a washing brush from an endoscope control section into all tubes, thereby facilitating washing works. In the endoscope control section, a water feeding pipe, for example, is separated into a front tube and a rear tube, and their openings are exposed as washing ports. A support portion of a tube unit is disposed so as to be attachable and detachable to and from the openings of these tubes, and a rear aspirating tube is disposed in the tube unit. This configuration makes it possible to detach and brush the tubes with a washing brush inserted from the openings into the front tubes on the side of a tip section and the rear tubes on the side of a cable. Further, control switches for opening and closing the tubes can be disposed on the tube unit, and elastic tube members may be disposed between the tubes on the side of the tube unit and the tubes on the side of the control section. Furthermore, the tube unit may be made of elastic rubber as a whole.

Abstract: In an imaging lens suitable for image reading of a four-lens element configuration comprising, successively from the object side, positive, positive, negative, and positive lenses, at least one surface of the fourth lens is made aspherical, whereby lighter weight and lower cost are achieved, while various kinds of aberration are corrected. The four-lens element imaging lens comprises, successively from the object side, positive first and second lenses L.sub.1 and L.sub.2 each having a surface on the object side convex toward the object side, a negative third lens L.sub.3 having a surface on the image side concave toward the image side, and a positive fourth lens L.sub.4 having at least one aspheric surface.

Abstract: An N-acylpiperazine derivative or a salt thereof expressed by the following formula 1: ##STR1## wherein R.sub.1 represents a pyridylcarbonyloxy lower alkyl group, a benzoylamino lower alkyl group, benzyl group, carbamoyl group, pyridyl group, or diphenylmethyl group;R.sub.2 represents a lower alkyl group or a lower alkoxy group;n represents an integer of 0 to 2;R.sub.3 represents a hydrogen atom, an alkenyl group, or benzyl group; andm represents an integer of 1 to 3.The N-acylpiperazine derivative or a salt thereof has an anti-ulcer effect, an antibacterial activity against Helicobacter pyroli, and high safety to be available for prevention or cure of various ulcers.

Abstract: A structure for reducing the stress between a HSQ dielectric layer and a metal layer. The structure comprises a metal layer, a stress buffer above the metal layer, and a spin-on-glass layer above the stress buffer. If the spin-on-glass layer is a dielectric material capable of producing tensile stress, the stress buffer layer is made from a material capable of generating compressive stress. On the contrary, if the spin-on-glass layer is a dielectric material capable of producing compressive stress, the stress buffer layer is made from a material capable of generating tensile stress.

Abstract: A part undergoing resonant ultrasound testing is simultaneously driven at a plurality of resonant test frequencies. The response of the part is measured simultaneously. There may be one or more driving transducers and one or more vibration sensing transducers.

Abstract: In a retro-focus type objective lens for an endoscope, its front-group concave lens system is constituted by two concave lenses, and a predetermined conditional expression is satisfied, so as to secure a sufficient length of back focus, while fully favorably correcting chromatic aberration in magnification. A four group lens configuration having five lenses comprising a front-group concave lens system composed of two concave lenses L.sub.1 and L.sub.2, a rear convex lens system composed of lenses L.sub.3 and L.sub.5, with an aperture stop interposed therebetween, in order to secure a long back focus at least three times the composite focal length of the whole system, satisfied is the following conditional expression:dx.gtoreq.3.0.times..vertline.f.sub.F .vertline. (1)wherein f.sub.