Abstract: A vibration generator includes a region including a first base plate structural element and a second base plate structural element. A first flow-passage-forming element is provided between the first base plate structural element and the second base plate structural element. The first flow-passage-forming element includes a first vertical flow passage and a horizontal flow passage. The first vertical flow passage supplies oil to a bottom face of the first base plate structural element and a bottom face of the second base plate structural element. The horizontal flow passage supplies oil to one of the side faces of the first base plate structural element and one of the side faces of the second base plate structural element opposite this one of the side faces of the first base plate structural element.

Abstract: A vibration generator includes a region including a first base plate structural element and a second base plate structural element. A first flow-passage-forming element is provided between the first base plate structural element and the second base plate structural element. The first flow-passage-forming element includes a first vertical flow passage and a horizontal flow passage. The first vertical flow passage supplies oil to a bottom face of the first base plate structural element and a bottom face of the second base plate structural element. The horizontal flow passage supplies oil to one of the side faces of the first base plate structural element and one of the side faces of the second base plate structural element opposite this one of the side faces of the first base plate structural element.

Abstract: A composite toothpaste product comprising a toothpaste containing a hydroxyapatite as a main active ingredient and another toothpaste containing a fluorine compound as a main active ingredient, which are enclosed with a container made of, for instance, a flexible tube but separated from each other by a partition united to the container. In the composite toothpaste product, the toothpastes are separated from each other with no contact when it is out of use, and are squeezed out of the container, when in use, in such a manner that the latter toothpaste is enclosed with the former. It is far more effective in removing bacterial plaque, improving tooth whiteness, and preventing dental caries than the conventional toothpaste products containing only either a hydroxyapatite or a fluorine compound.

Abstract: A vibration testing apparatus which is minimized in size and capable of being assembled with ease includes a vibrating section (11), a vibration generator (10), and a transmitting section (21) for transmitting vibrations from the vibration generator (10) to the vibrating section. The transmitting section (21) is formed with a pair of opposed parallel pressure-receiving plates (23, 24) that are orthogonal to the direction of vibrations, with the vibrating section (11) interposed between the pressure-receiving plates. The vibrating section (11) is formed with pressure-bearing surfaces (14) in opposed parallel relation to the pair of pressure-receiving plates (23, 24). High pressure fluid is fed into clearances (16), defined between the pressure-receiving plates (23, 24) and the pressure-bearing surfaces (14), to form a static pressure bearing. The pressure-receiving plates (23, 24) are clamped by a connecting member (25) under a load whose value enables the static pressure bearing to function as a spring.