Mfg. nest boxes for animals and bird feed houses

摘要

The hollow bodies of the boxes and feed houses are not made by casting or pressing of light concrete material, but by machining, such as sawing, drilling, milling etc. of conventional light concrete blocks. The individual parts, e.g. the roof, are glued together by a structural adhesive. The material for the mfr. consists of conventional blocks of any type of light concrete. The surfaces are plaster coated, or pickled in an immersion process. They are hardened by silicate, plastics, or synthetic resin, or coated with such materials.