73293482
Jan 19, 1981
Jan 12, 1982
Electrically Driven Commercial Vacuum Cleaning Systems which Comprise a Central Source of Vacuum, Conduits Leading to Wall Outlets, Flexible Hoses and Vacuum Cleaning Heads
MachineryElectrically Driven Domestic Vacuum Cleaning Systems which Comprise a Central Source of Vacuum, Conduits Leading to Wall Outlets, Flexible Hoses and Vacuum Cleaning Heads
Electrical and Scientific Apparatus