
A curb chain, or curb strap, is a piece of horse tack required for proper use on any type of curb bit. It is a flat linked chain or flat strap that runs under the chin groove of the horse, between the bit shank`s purchase arms. It has a buckle or hook attachment and English designs have a `fly link` in the middle to hold a lip strap. On English......
Found on
http://en.wikipedia.org/wiki/Curb_chain

The chain attached to the bit passing under the horse's chin
Found on
http://www.gaitedhorses.net/Articles/HorseGlossary.html

The curb chain is one where the links interlocks into themselves when laid completely flat and these make some of the most popular chains for all jewellery, particularly for items that have thicker widths. A figaro is a subset of a Curb.
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https://www.encyclo.co.uk/local/22607
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