| http://www.w3.org/ns/prov#value | - the brush including the improvement whereby said resilient spot deformation of the membrane is made possible by said brush head including a cavity facing the set of openings through the wall, said cavity being common to all of said openings and being on the opposite side of said membrane from said first face of the wall, and said membrane being made of an isotropic material and behaving anisotropi
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