Abstract: There is indicated a web of bags comprising a carrying strip (20), on which individual bags (22) are fastened through discrete suspension sections (24). In the suspension sections (24), there are provided in the end that is to the rear in the direction of delivery during packaging notches (30) which extend to the edge of the suspension sections (24) and which facilitate the blowing-open of the bags (22) in an air curtain that is disposed substantially in the bag plane and is directed towards the filling aperture of the bag. For the very first lifting of the bag front wall, there may be provided in the bag rear wall, at the level of the end of the front wall of the bag, additional holes (18) through which a jet that is vertical on the bag plane can be directed towards the front wall of the bags.

Abstract: A windshield wiper system comprises a wiper blade having two wiper lips extending in spaced parallel relationship. The wiper lips are interconnected at the ends thereof by further wiper lip portions to define a continuous seal cooperating with the surface of the windshield to be cleaned to define an essentially closed cavity. The latter communicates with cleaning liquid supply means adapted to completely fill said cavity and establish a positive pressure therein. An ultrasonic transducer assembly is acoustically coupled to the surface of the windshield by the mass of water contained in the cavity. By moving the wiper blade together with the ultrasonic transducer assembly across the windshield the dirt clinging to the surface of the windshield becomes detached and suspended in the cleaning liquid. Thus the dirt is most effectively removed.