| 摘要 |
<p>A window washing assembly comprising an elongated spray bar suspended from a cable or the like along the side of a building by way of a pulley located at the roof of the building, and a ground control unit including a motorized cable reel for selectively positioning the spray bar by way of the support cable, and controls for selectively controlling the mixture of water and cleaning solution supplied to the spray bar by way of a delivery hose extending between the ground unit and the spray bar.</p> |
