Abstract: An apparatus for the dissolution of ozone in a fluid such as water, for its treatment by the ozone, by injection in said fluid of ozonic air or ozonic gas, including at least one tube placed vertically in a vertical tubular enclosure and communicating with this enclosure via its lower end and via its upper end with means for supplying the fluid to be treated and the ozonic air or ozonic gas. Said vertical tubular enclosure is closed at both its ends and provided with means for the discharge of the fluid treated and of the ozonic air or gas in excess, characterized in that it is provided with means for the injection of hydrogen peroxide so as to complete the oxidation reaction through a radical route.

Abstract: An apparatus for dissolving ozone in a fluid includes a vertically extending closed chamber, and at least one tube extending vertically into the chamber and having a lower end opening into the chamber. Fluid to be treated and ozonized gas is introduced into the upper end of the tube, such that the fluid and gas pass downwardly through the tube, are discharged from the lower end of the tube into a lower end of the chamber, and then passed upwardly through the chamber, whereby ozone dissolves in the fluid. Structures are provided at the upper end of the chamber for discharging fluid having dissolved therein the ozone and excess gas.

Abstract: An arrangement of a seat structure of a vehicle equipped with a hooking device for safety belts. The seat structure comprises a backrest and a seat and the backrest is mounted at the base thereof on the rear of the seat to pivot about a first transverse axis. The seat is mounted in the vicinity of the front part thereof to pivot about a second transverse axis. The hooking device is fixed to the seat and a connecting assembly is provided for connecting the hooking device to the floor of the vehicle. The connecting assembly comprises a latch carried by the hooking device and a keeper which is pivotally mounted on the floor. A device acting in opposition to elastically yieldable apparatuses is provided for maintaining the keeper engaged with the latch when the backrest is in the operative position thereof.

Abstract: The invention concerns seat structures comprising a seat mounted to pivot through about 180.degree. about a transverse axis located in the vicinity of its front part and a backrest which is capable of being swung over forwardly through about 90.degree. about a transverse axis located adjacent its lower part. According to the invention, on at least one side of the seat there is provided a handle which is mounted on the seat to pivot about a transverse axis, this handle being associated with a protecting panel which is disposed flat under the seat in the normal position of use and is raisable so as to be roughly perpendicular to the seat in the utility position. In this position, the handle defines a support surface for the seat in the utility position.Application to vehicles of the semi-utility or break type.