| http://www.w3.org/ns/prov#value | - It has also proven advantageous to equip the filter on at least one side with a protective layer containing boron, carbon, nitrogen, and/or oxygen, or compounds thereof, such as hydrocarbons, oxides, carbides, nitrides, borides, SiC, BN, BCN, B4C, etc., which hereinafter will be abbreviated as ???BCNO???.
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