A stair cleaning device 6 wherein the area swept by the cleaning heads on rotation of the disc is {HEAD ~ a circle} having {TAIL ~ a diameter} of about 200 mm 
having
A stair cleaning device 6 wherein the area swept by the cleaning heads on rotation of the disc is { HEAD ~ a circle } having { TAIL ~ a diameter } of about 200 mm
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH