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David G H Crawford
David G H Crawford, now retired, spent the greater part of his early career trouble-shooting electro-hydraulic plant installations throughout many industries and has a long standin...voir plusDavid G H Crawford, now retired, spent the greater part of his early career trouble-shooting electro-hydraulic plant installations throughout many industries and has a long standing interest in physics. He decided on his eightieth birthday, to sit a MENSA test in Nottingham, which he successfully qualified in. David lives in Clackmannashire, Scotland.voir moins