Abstract: A solar energy-collecting modular element for enclosure, and modular system for forming solar energy-collecting enclosures in buildings is described. The modular solar energy-collecting enclosure element comprises an outer plate and inner plate, facing each other and joined together by at least one leak-tight joint line along a closed perimeter. One or both plates include one or more hollow conformations within the perimeter that form a circuit for a heat-carrying fluid with an inlet and an outlet. The joint line is at a distance from the downstream transversal edges from the outer and inner plates thereby providing an accessible gap between respective free outer and inner portions of the outer and inner plates downstream from the joint line. This accessible gap is adapted to be plug-connected to an upstream free portion of the outer plate of a similar adjacent modular element located downstream.

Abstract: A plastic injection apparatus for making shoes that includes one molding block composed of two halves that define a cooperative cavity for forming the sole of the shoe and two shoe molds of different contiguous sizes. The cavity includes an inwardly extending peripheral flange at its upper edge. The shoe molds have such dimensions that an adjusting peripheral line is defined around each one of the shoe molds of such dimensions that when both shoes are placed in the molding block, the flange is brought adjacent to the adjusting peripheral line.