. "Polhammar, Chrisopher"@en . "1661Z"^^ . . . . . . . . . . "Christopher Polhammar (18 December 1661 \u2013 30 August 1751), better known as About this sound Christopher Polhem , which he took after his ennoblement, was a Swedish scientist, inventor and industrialist. He made significant contributions to the economic and industrial development of Sweden, particularly mining."@en . . "1751Z"^^ . . "Christopher Polhem"@en . "1661-12-18Z"^^ . . "1751-08-30Z"^^ . "scientistandinventor" . "Polhem, Christopher"@en .