RAF4EVER Posted January 20 Posted January 20 Whitworth? https://www.google.nl/url?sa=t&source=web&rct=j&opi=89978449&url=https://en.wikipedia.org/wiki/British_Standard_Whitworth&ved=2ahUKEwjrmPv_uYSLAxU-gP0HHXtYBbgQFnoECBwQAw&usg=AOvVaw2ZWTMhjldJWcaB0AGaBWbk 2
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