Molten Corporation

Mitsubishi Denki K.k.

Masayuki Tanaka

Hideomi Shishido

Shigeo Doi

Yukinori Nagao

Norihiro Yuki

Mitsuo Koyama

Katsumi Kobayashi

Hideki Sumida

A whistle () has: a mouthpiece which includes an air inlet (); a first and a second resonance chambers () to which air is injected through the air inlet via a first and a second air passages (); a first and a second sound outlets () in the form of openings formed between the air passages and the resonance chambers; and a first and a second air flow converters () for varying the flow of air between the air passages and the sound outlets. The air flow converters () are each part of the sound outlets, and have walls () which are perpendicular to the air passages (). The air flow converters () create extra higher harmonics, increase sound pressures in the resonance chambers, and shorten rising time of the whistle, so that the whistle quickly produces loud harmonious beats, which is effective to call attention of people.

Whistle having air flow converter

Display apparatus for use in athletic games

A ball for ball game comprises a rubber hollow spherical bladder, a valve holder fixed to the tube for charging air into the tube, a valve member attached to the valve holder; a fabric layer covering the bladder surface and a leather layer. The fabric layer is composed of a plurality of equilateral quadrilateral pieces sewn together to form a sphere. The equilateral quadrilateral pieces each include two sheets of approximately trapezodial fabric pieces that are sewed together symmetrically at a central seam line. The equilateral quadrilaterla pieces are sewed together such that central seam lines of adjacent equilateral quadrilateral pieces fall at right angles to ech other. The fabric layer gives sphericity, dimensional stability and durability to the ball. The leather layer is adhered to the fabric layer directly or through a rubber based thin intermediate layer. On a circumferential line in the fabric layer which includes one seam line, at least one other seam line exists at a prescribed interval to equally divide the un-sewn portions. All segments on the spherical surface of the fabric layer, which are divided by a plurality of circumferential lines including all of the seam lines, have the same shape.

Game ball

A color ink ribbon in which one half of the width of the ribbon is utilized for the left-to-right (first) printing direction and the other half of the width is utilized for the right-to-left (second) printing direction, and in which the sequence of ink layers composed of at least three colors is the same for both printing directions, whereby the ribbon can be used for printing in both the forward and reverse directions without wasteful non-utilization of areas in either half of the ribbon.

Color ink ribbon

Growing community of inventors

Hiroshima, Japan

Masayuki Tanaka