| 摘要 |
A cleaning head for a hard or a yielding surface cleaning machine having a cleaning and a suction chamber therein, the cleaning head having an annular seal overlying the bottom edge portion thereof, the cleaning head having an incoming jet stream of aerated cleaning fluid, the seal having a predetermined density, porosity or particularly defined air passages to provide a controlled accessability of air into the cleaning chamber in operative association therein with the incoming stream of cleaning fluid.
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