The internal cavity (20) includes a cylindrical inner surface having an annular housing retention groove (30) and a spaced apart annular seal groove (32).

The circular groove (8) surrounds the outside of the bottle opening (6).

An annular lock washer made of metal is held in the annular groove.

The damping piston contains a circumferential groove (48) that is directly communicated to the termination of the axial segment.

A circular groove (8) is provided on the surface of the upper end of the bottle neck (2).

The connector member has a head (26), a threaded portion (32) and an annular groove (36).

The seal member (16) includes a pair of diverging flanges (22, 23) and defines a circular groove (20).

A tube (17) communicates at its upstream end with a circumferential groove (15) which leads to ventilation perforations (14).

An annular groove is located on the exterior of both end areas of the tube, in which a support ring is inlaid.

A method of socketing a pipe of oriented plastic having an annular groove inside the socket.

The two parts are maintained interlocked through a pin (25) housed in a circular groove (26).

The outer periphery of each pressing roller has a circular-arc groove coupled to the rope and is formed of an elastic body.

A twist ring (10) for placement in an annular groove having a generally C-shaped region with two ends.

The invention provides a lock nut with a nut body which has a threaded section with an internal thread and an adjoining inner annular groove.

Each pin fits in one of four corresponding holes that are made ready in the disc wheel or in a circular groove inside the wheel sleeve.