131525 ⎘
Forms or shutterings for making openings, cavities, slits, or channels for cavities or channels in walls of floors, e.g. for making chimneys; Re-usable forms with fluid means to modify the section
Inflatable cavity fill or cavity forming member
#2METHOD AND APPARATUS FOR THE MANUFACTURE OF PRE-CAST BUILDING PANELS
#3Method and Apparatus for the Manufacturing
#4Apparatus and method for forming cavities of complex configuration within concrete
#5Method for forming cavities of complex configuration within concrete
#6Method for forming caves on a construction and a body made with the caves by the method