73173985
Jun 12, 1978
Apr 1, 1980
INDUSTRIAL VACUUM CLEANING SYSTEM COMPRISING A CENTRAL VACUUM CHAMBER IN WHICH ARE HOUSED AN ELECTRIC MOTOR, BLOWER AND FILTER, AND DUCTS AND CLEANING ATTACHMENTS THEREFOR
MachineryDOMESTIC VACUUM CLEANING SYSTEMS COMPRISING A CENTRAL VACUUM CHAMBER IN WHICH ARE HOUSED AN ELECTRIC MOTOR, BLOWER AND FILTER, AND DUCTS AND CLEANING ATTACHMENTS THEREFOR
Electrical and Scientific Apparatus