A circular ring-shaped encoder (9a) is attached and affixed to the outer side surface of an outer circular ring section (24) of the slinger (21).

Several self-lock levers (53) are also provided on the circular ring.

An annular groove is formed along the circumference at the back of the circular ring.

The circular ring (16) is connected with the flow passage in one port of the valve body.

A plurality of arc bayonets (52) which are continuous with each other are provided at the inner circular periphery of the circular ring in the same direction.

Notches (51) are uniformly provided at the inner circular periphery of the circular ring, the number of which corresponds to the number of the protrusions (21).

The hinge bolt has a circular ring formed at the upper portion thereof and a screw thread formed at the lower portion thereof, wherein the circular ring has a through hole formed therein.

The rear end of the valve sleeve is connected with a circular ring (16) by a support (20).

The mid-section (12) has, on the upper periphery thereof, a circular ring (21) on which the bezel (13) is mounted such as to turn, said ring comprising a horizontal slot (23).

It must be said that the absence of a circular ring is always so regrettable.

The fixing member (5) is a circular ring which matches with the shape of the drainage device body (2).

The writing instrument also has a circular-shaped ring (210), having a pin-inserting hole, which is a hole through which the pivot pin is penetrated.

Bezel: steel, with circular ring in aluminium coloured by iodine oxidation (eloxage) showing the hours scale

Inside, you see a circular ring filled with paintings of Mongolian and Russian comradery.

The piston rod has a circular bushing that engages an outer diameter portion of an outer crank member.