Abstract: The system has a reader of electronic labels comprising several devices for the transmission/reception of electromagnetic waves, offset angularly about a median axis so that, when the reader is placed in the vicinity of a label and irrespectively of their relative orientation, at least a part of the lines of the magnetic field generated by at least one of said transmission/reception devices can get looped by passing into the coil of the label in the direction of its axis. The label has a foil made of amagnetic and conductive material placed against the antenna and parallel to it to form a reflective screen for the electromagnetic waves. Application to the contact-free identification of objects, notably metal objects, such as gas cylinders.

Abstract: A cap for a cylinder of gas comprising a lower portion (2) adapted to be mounted on a gas cylinder (3) and an upper portion (1) defining internally a space (20-19) protecting a gas distribution valve structure (4) secured to the cylinder. The lower portion (2) comprises a portion (8) that projects laterally relative to the cylinder and comprises a downwardly opening cut out (12) permitting the support by hooking of the cap/cylinder assembly on a structural support element. The projecting portion (8) has a transverse external profile which is flat or of large radius of curvature permitting supporting on a flat surface the cap/cylinder assembly. The upper portion (1) comprises a transverse handle (22) in substantially vertical alignment with the laterally projecting portion (8). The upper portion (1) comprises two lateral vertical ribs (23A, 23B) connecting the handle (22) to the projecting portion (8). The cap/cylinder assembly is useful particularly for medical oxygen.