An improved flexible wiping blade for the vacuum pickup squeegee of a floor scrubbing machine. A series of small protuberances with spaces between them are provided at the lower edge of the blade on its surface that leads when the machine moves backward. At that time the reverse flexing of the blade...http://www.google.fr/patents/US5212848?utm_source=gb-gplus-shareBrevet US5212848 - Squeegee blade
