Abstract: The apparatus measures the liquid volume of a liquid or liquids held in one or more containers. This apparatus has no moving parts and includes an open-ended dynamic pressure tube standing in each container with its open tube end at the lowest point of the container on the bottom surface of it and a pressure measurement converter closing the other tube end so as to form an air column between the pressure measurement converter and a liquid level in it. The apparatus also includes an electronic analyzing device (3,4) including an electronic circuit (3) connected electrically to the pressure measurement converter and producing an electronic signal characteristic of a liquid volume in the container and a digital meter for displaying a volume reading.

Abstract: A toothbrush having an elongated handle, the handle defining a center plane containing the longitudinal axis. A pair of bristle-bearing segments, each segment containing a plurality of bristles mounted therein, is connected to the handle by a pair of short arms. The arms, bristle-bearing segments, and the handle form a fork having two prongs, each prong containing one bristle-bearing segment and one connecting arm. The prongs are located on opposite sides of the first center plane and below a second center plane perpendicular to the first center plane. The bristle-bearing segments have mutually facing inside surfaces sloping toward each other in a gable-manner and intersect above the upper side of the handle at a first angle of less than 55.degree.. The free ends of the bristles bound a gap and define side surfaces sloping in a gable-manner toward each other intersecting above the gap and at a second angle which is less than the first angle.

Abstract: A toothbrush which comprises an elongated handle including a U-shaped head coaxial with a front end of the handle. The head is provided with two opposite bristles-carrying portions located to opposite sides of an axis of the head and each of the portions has a front edge which is inclined at an acute angle to the axis. The toothbrush further includes a plurality of bristle tufts which are spaced from each other inwardly from the bristle-carrying portions and are arranged in a first plurality of rows which is substantially parallel to the front edge and in a second plurality of rows parallel to the axis. The ends of the bristles in the second plurality of rows on the opposite bristles-carrying portions are arranged to define an acute gap therebetween.