Bar-link chain

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Top view of a segment from a "bar-link" bicycle chain.
Block chain on a bicycle by Laurin & Klement, exhibited at the Škoda Muzeum
Bicycle chain of the bar-link or block chain type on safety bicycle in a vintage (c1900) photograph

A bar-link chain, also called a block-and-bar chain or a block chain, is a mechanical drive chain. It is composed of side plates, where each plate straddles one end of a block and is connected to the block with a pin going through a hole at one end of the block.

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