Each interchangeable mask components can be removeably attachable to the frame.

An embodiment of the system includes an article, locking unit, component support member, and interchangeable component.

A first member (4) comprises a body (18) having connecting means (20) for connecting to at least one alternative interchangeable member.

A tool support member is pivotally connected to the follower by a second pair of spaced link arms.

The appliance can be adapted to various operational modes and mixer cartridges by replacing said intermediate element.

Consequently, the area of the suction holes for sucking the air can be changed by replacing the changing member (20) with another switching member having other air passages.

The drill comprises a replaceable member for continuous cutting, which does not have flutes and is provided with radial supports that are capable of cutting.

The bowling lane (3) consists of a replaceable element.

This replaceable element can be designed as a trellis-type extending surface, an asphalt surface of another type of surface and may be made up of several components.

A single generally cylindrical foam cell (10) having openings (12, 14) at both ends is provided wherein an interchangeable foam cell insert (20) having varied geometry is longitudinally disposed within the foam cell (10).

The cultivator has a support frame (2) moveable relative to the ground surface and a follower first pivotally connected to the support frame by a first pair of spaced link arms.

Fiber garment, placed on the top of the sponge as a leveling filter, anti-humidity filter and interchangeable element in case of stain or prolonged use.