Abstract: A dental X-ray holder for use in endodontics, for positioning a dental X-ray film in a predetermined position in the mouth for retention of the film in a given position at each placement of the holder by the patient's bite on the holder, comprises a film retaining member having an inner tongue and an outer tongue defining a slot therebetween for receiving and holding an X-ray film packet; two spaced apart side walls integral with the respective side edges of the film retaining member, the side walls together with the film retaining member defining a U-shaped area therebetween for accommodating endodontic equipment, such as a rubber dam clamp and root canal files; two flanges, the transverse edge of each flange integral with the upper edge of the adjacent side wall and the longitudinal edge of each flange integral with the adjacent portions of the upper edge of the film retaining member for providing rigidity; and a positioning arm which may be removably attached to either side wall.

Abstract: A hanger for exhaust system components wherein a loop of reinforced resilient sheet material is disposed between the exhaust system and the vehicle, and overlapping brackets from the exhaust system and the vehicle hold the resilient loop in compression. In the event of failure of the compressed loop, the brackets may interengage to provide continued support for the exhaust system.

Abstract: Air or other gases containing contaminants or requiring treatment are moved into at least one substantially continuous sheet of treating liquid at the entrance to a streamline flow passage. A nozzle mounted adjacent the entrance end of the flow passage forms one or more substantially continuous solid sheets of treating liquid covering the entrance to the passage. The passage has a convex throat and an exit smaller than the entrance so that the gas and treating liquid entrained therein move through the passage at an accelerating velocity with smooth, non-turbulent, unidirectional flow, and are discharged therefrom with no discernible turbulence or splashing. The gas and the treating liquid are discharged from the flow passaage into an eliminator chamber of large volume, whereupon the treating liquid and any entrained contaminants drop out of and are separated from the gas.