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An Entity of Type : prov:Entity, within Data Space : webisadb.webdatacommons.org associated with source dataset(s)

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  • The invention has relation to facial masks for the use of surgeons, nurses and others, in operating rooms, hospitals and other places, having for an object to provide a satisfactory comfortable germ or spray proof mask which can be readily made in quantity at the cost of a fraction of a cent each so that it may be discarded after use, whereas the ordinary facial mask or such masks as have been dev
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