Abstract: A portable telephone has a telephone body (1) with a first liquid crystal display (2) formed on the frontal face of the telephone body, a swingable plate (4) connected by a hinge (3) to one of lateral edges of said body (1), and a second liquid crystal display (5) formed in and disposed on the swingable plate (4). The second crystal display (5) will be at its exposed position to face backwards when the plate (4) is at its closed position folded back in a close contact with the rear face of the telephone body (1), and the swingable plate (4) can pivot forwards so that the second display (5) faces the same direction as the first display (2).

Abstract: A washer for accommodating the shank of a threaded bolt is formed with at least one slanted opposing face having an angle such that the lower face of a nut, threaded on the bolt, is urged into entire surface contact with the upper face of the washer, while the lower face of the washer is urged into entire surface contact with the upper surface of the article fastened to the bolt. Embodiments include an inclination angle of about 2 degrees to about 2.4 degrees, thereby providing an adequate shearing stress to the shank while concurrently providing a substantially vertical force to the upper face of the article to prevent loosening of the knot.

Abstract: A door closer has a cylindrical body `A` installed in a swing door and a base plate `B` fixed to a wall `C` standing still and near the door. The body `A` has an oil-hydraulic third cylinder 3 fixed by a connecting pin 4 in a second cylinder 2, which slides in a first cylinder 1 serving as an outer casing. A piston rod 7 displaceable into and out of the third cylinder has a front end fixed to a piston 5 in this, and a rear end fixed to a piston 6 at rear end of the second cylinder. A tie rod 9 connects the second cylinder's front end to the base plate, and an airtight chamber 10 is defined between the piston 6 and the first cylinder's inner end wall. An air suction passage 12 is formed through which the chamber communicates with atmosphere, a one-way valve 11 disposed in the passage allows only suction of air into the chamber, and a thin ventilation hole 13 communicates with the airtight chamber.