Abstract: A filter for high-viscosity fluids can be used in small to large-sized units, shows no thermal deterioration of the contents, and allows simple, rapid, and safe exchanging of the filter units and has a structure in which at least one filter element is built in, such that when a filter unit having an inlet opening and an outlet opening has the aforementioned inlet opening attached to the outlet opening of the unit on the upstream side and the aforementioned outlet opening attached to the inlet opening of the unit on the downstream side, two supporting plates, one fixed and one movable, are attached to an inlet-side adapter and an outlet-side adapter, the aforementioned filter unit is surrounded by said fixed supporting plate and movable supporting plate, and by moving the movable supporting plate, the various connecting parts can be closed and opened.

Abstract: In an air cooling system including a compressor, a condenser, a liquid tank, an expansion valve and an evaporator which are connected through conduits to form a closed circuit refrigeration system, there is provided a refrigerant over-charging checking system for preventing the system from being overcharged with the refrigerant. The checking system comprises a service valve mounted in a conduit of the system and having therein a refrigerant inlet passage for flowing the refrigerant into the closed refrigeration system, a check mechanism associated with the service valve to block the refrigerant inlet passage when electrically energized, and a liquid level sensor associated with the liquid tank to electrically energize the check mechanism when a refrigerant level in the liquid tank rises to a predetermined level.

Abstract: Disclosed are a printing method for obtaining an outline design for child's painting and other simple printing materials, which comprises placing an embossed pattern plate, carbon paper and a sheet of paper to be printed on a printing frame in this sequence; and allowing the printing frame holding thereon the embossed pattern plate, carbon paper, and sheet of paper to pass through a spacing between a pair of rollers consisting of upper and lower rollers which are disposed in parallel and spaced from each other at a space substantially equal to the thickness of said printing frame, to transferring onto the sheet of paper the pattern of the outline design on the embossed plate under the pressure of said rollers, and an apparatus for carrying out such method, which comprises a main body including a main mechanical unit equipped with upper and lower rollers disposed in parallel, spaced from each other and adapted to be rotated by a driving means; and a printing frame which is adapted to receive thereon an embosse