Abstract: The present invention relates to a method of manufacturing a lightning arrester, the method being of the type comprising steps consisting in making a stack of varistors (100), and in forming a cover (300) made of a composite material over the stack of varistors (100), said method being characterized by the fact that the step of forming a cover (300) made of a composite material consists in placing a woven fiber fabric (310) on the outside of the stack of varistors (100) and in contact therewith, in placing a flexible outer cover (400) on the outside of the stack of varistors (100), and in injecting a material (350) suitable for impregnating the fiber fabric (310) into the annular space formed between the stack of varistors (100) and the flexible outer cover (400).

Abstract: This invention relates to the monitoring of the correct operation of a respirator with single source of energy constituted by a cylinder of pressurized oxygen, to which is annexed a device for connection to a patient. Such monitoring is effected with the aid of a pneumatically operating device which comprises a comparator with adjustable threshold, connected to the mask for connecting to the patient and followed by an amplifier whose output signal takes the binary logic level 1 during the time when the insufflation pressure in the mask is greater than said threshold, and takes the other binary logic level 0 in the opposite case, and a circuit for processing this signal, which triggers off an alarm device if the duration of the time intervals when this latter is at level 1 is too long or too short with respect to a predetermined normal value.