A roller shutter (1) comprising a shutter (5) moveable between a retracted position and an extended position is described.

The aperture device comprises a transmitter aperture (14) and/or a receiver aperture (16).

An optical plug the coming off of which, caused by an erroneous operation, is prevented and in which an error operation preventing mechanism is provided.

Optical shutter (50), e.g. fortstereoscopic shutter glasses, is disclosed.

It comprises an actuator coupled to a plug with a valve seat in the proximity of said plug.

The invention (product) is related to the translucent shutter and apparatus system which enables this shutter to be mounted to PVC, aluminum or sheet make shutter.

The liner is closed by a cap.

A visual insufflation obturator is provided.

The invention relates to a pinch valve (1), in the valve housing (2) of which a cartridge-like component (32b) is inserted in a detachable manner, which has a tubular valve member (14) and a support tube (18) disposed around the same.

A laparoscopic device with obturator.

The primary shutter comprises a closure (11).

The invention also relates to a false stump, an obturator and a stabiliser.

A shutter for a light source is described, the shutter being switchable between a substantially opaque condition and a substantially transparent condition.

One of the devices is a hydraulic door stopper plug (12, 14) and pneumatic stopper (16) that prevents sewage runoff. the devices are make of cold reeled lamina and metallic plate placed in the previous installation os the drainage.

The present invention relates to a mechanical shutter (601) that comprises a shutter element having a layer of polymerized liquid crystal.