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Nelthropp & Harris were Englishmen who went to Denmark in 1785. They owned Nymölle Paper Mill and Örholm Mill.They were granted permission to establish Nymölle Paper Mill 1790.
From the Wikipedia entry for Ørholm:-
In 1793, Henry Nelthropp and John Joseph Harris, converted Ørholm Watermill into a paper mill which mainly produced print paper, wallpaper and blue wrapping paper. The following year they expanded their business with the acquisition of Nymølle. From 1830 the company was in decline due to the competition from the much larger paper manufacturer Strandmøllen further downstream. In 1854, Ørholm and Nymølle were sold to the owners of Strandmøllen and became part of a Danish de facto paper monopoly.