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Hasn't that been superseded by BS EN ISO 4210-1-2014
http://www.freestd.us/soft4/3634498.htm
Hasn't that been superseded by BS EN ISO 4210-1-2014
http://www.freestd.us/soft4/3634498.htm
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hippy
Looking up the answer in EN14781...yup, 4mm as I thought