Classification opinions
… internal surface of a steel sheet, of an asbestos-cement panel, or of a sheet of plaster, etc., the space between the … insulating material (tarred paperboard, cellular plastics, mineral wool, expanded mica or vermiculite, wood fibres, … consisting of E-section margining, supporting bars of a thickness ranging between 2 and 5 mm and a width of 20 to 50 …