Abstract: A rotary disc atomizer having a disc having an axis and rotatable about the axis, the disc also having two opposite surfaces as considered in an axial direction, and a peripheral edge, the disc having a plurality of throughgoing openings so that when a liquid is supplied to one of the surfaces and flows toward the edge and then droplets are sprayed, the liquid also flows through the throughgoing holes to another of the surfaces so as to also flow radially outwardly on the other surface and form droplets thrown from the edge in a region of the other surface.

Abstract: A method of sterilization of human and animal males has the steps of acting on testicles with a thermal energy, and providing the thermal energy by a microwave radiation with a radiator which is located at a distance from the testicles and supplies the radiation to the testicles so as to heat the testicles to a temperature which provides their sterilization.

Abstract: A rotary disc atomizer having a disc having an axis and rotatable about the axis, the disc also having two opposite surfaces as considered in an axial direction, and a peripheral edge, the disc having a plurality of throughgoing openings so that when a liquid is supplied to one of the surfaces and flows toward the edge and then droplets are sprayed, the liquid also flows through the throughgoing holes to another of the surfaces so as to also flow radially outwardly on the other surface and form droplets thrown from the edge in a region of the other surface.

Abstract: For a biological contamination by mail of a person to who it is addressed an envelope is used which has a material which forms an envelope with a closed inner space, and at least one throughgoing opening provided in the material so as to communicate an interior of the envelope with its exterior so that if a particulate material is introduced into the interior of the envelope it will discharge through the at least one through going opening outwardly and the particulate material will not stay in the interior of the envelope.

Abstract: A carrier for writing symbols, such as numerals and the like, comprising a base, and a plurality of designated areas each formed by a plurality of individual elements, each of the areas being marked by indicating of corresponding individual elements so as to provide identical numerals and the like regardless of handwriting of an individual.