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19th-century earthenware bacterial filter.
[Berkefield, name of the mine from which earthenware material was taken]
[Wilhelm Berkefeld, Ger. manufacturer, 1836–1897]
A filter of diatomaceous earth designed to allow virus-size particles to pass through.
Berkefeld,name of a mine owner from which material to make filter was taken.
Berkefeld filter - filter for bacteria.