In today’s fun and challenging puzzle we feature a old rusty chain. The metal link chain has been in use since at least 225 BC. Chains can be classified by their design, which is dictated by their use. Some are used to for lifting, such as when used with a hoist; for pulling; or for securing. These have links that are torus shaped, which make the chain flexible in two dimensions. Others are designed for transferring power in machines. These are designed to interconnect with the teeth of the sprockets of the machine.
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