6 DOORS, WINDOW, BLINDS, SAFETY-LOCKS AND KEYS SUBSTANTIALLY MADE OF METAL; METAL FITTINGS FOR DOORS AND WINDOWS AND FOR THE SUSPENSION AND THE ADJUSTING OF CURTAINS AND BLINDS; PLUG-IN CONNECTORS MADE OF METAL FOR INTERCONNECTING METAL TUBES FOR ASSEMBLING FRAMEWORK, WORK TABLES, PARTITION WALLS AND THE LIKE