Abstract: An asymmetric double-sided substrate scrubber is provided. The asymmetric double-sided substrate scrubber includes a first roller and a second roller. The first roller is constructed from a first material having a first density and the second roller is constructed from a second material having a second density. The second density is designed to be greater than the first density. The first roller is designed to be applied onto a first side of a substrate with a first force and the second roller is designed to be applied onto a second side of the substrate with a second force. The second force is configured to be substantially equivalent to the first force.

Abstract: A seal features a first curved region generally concave in a direction of concavity, and a second curved region generally concave in the direction of the concavity of the first curved region. The second curved region is oriented within the direction of concavity of the first curved region. A first bend connects the first curved region to the second curved region, and a second bend connects the first curved region to the second curved region.

Abstract: Device for prevention of sterotorous breathing or snoring and adapted to be fixed in a person's upper part of the mouth and being characterized in comprising a non-rigid and flexible transverse girder for fixation in the upper part of a person's mouth, preferably at the back of the upper part of the mouth, and a tongue catching member extending downwardly from the non-rigid and flexible transverse girder and produced from an elastic material and which is adapted to fixate the tongue in a forward position so that it does not block the respiratory passages.