The Frangible Pin was the first major development in the whole program of reducing rotational falls in eventing. These were developed in the UK with British Eventing and the Transport Research Laboratory working in partnership.
It must be said that British Eventing is still at the forefront of new technology development and research.
Here is the link to the frangible pin history it is definitely a good place to start when you want to learn about safety products. On this page there are also links to
Finally once finished there you should go on to the British Eventing Safety Manifesto and read up on the present and future goals.
Next up I will follow up on the USEA & USEF to talk a little about what is happening on the other side of the Atlantic.