expanded by the large oval axis of the bottle contour the recesses 68 even act in an ejecting manner on the ring r since the upper edge of the control step 69 runs as far as the level of the recess base other reference numerals are inserted to assist with comprehension although repetition of the text passages is omitted here from fig4 et seq the measures developing the screwing version will now be referred to in detail the main difference from the above described solutions resides in the formation of a coding this is intended to ensure that a quite defined pairing of closure and container is achieved to this end the procedure is such that the ring r is formed with different sections 16 u2032 16 u2033 each extending over half the circumference and having a fitting or blocking but counterpart on the container the sections are shown in the movement study of fig4 50 51 53 by hatching such a measure is useful in the case of asymmetrical container shapes in which it is therefore necessary to continue the formation shapes in a visually non disturbing manner between the two basic components of the vessel namely closure and container in constructional terms this is specifically embodied by in the closure position a section 16 u2032 of the ring 16 lying in an undergripping space 72 with respect to a first latching projection 4 u2032 of the bottle neck 2 whereas when a closure cap 1 is turned through 180 u00b0 the same section 16 u2032 engages against the ridge of a second latching projection 4 u2033 formed opposite the undergripping space 72 of the first latching projection 4 u2033 without being prevented from being pulled off upwards i e away from the bottle.