Chain

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Chains are connected serialized serial assemblies, called links, usually made of metal, with an overall character similar to a rope as it is flexible and curved in compression but linear, rigid, and load in tension. The chain can consist of two links or more. Chains can be classified according to their design, determined by their use:

Designed to be lifted, such as when used with a hoist; to attract; or to secure, such as with a bicycle key, has a torous link, which makes the chain flexible in two dimensions (The third dimension remains the length of the chain). A small chain that serves as a jewelry is largely a decorative analog of such types..
What is designed to transfer power on machines has links designed to blend into machine sprocket teeth, and flexible in just one dimension. They are known as roller chains, although there are also non-roller chains like chain blocks.

Two different chains can be connected using fast links, carabiners, or clevis.

Video Chain

Usage for the chain

The metal connecting chain has been in use since at least 225 BC.

Maps Chain

Symbolism

The usual modern symbolism is oppression, because of its use for the mechanical limitation of human or animal freedom.

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