| http://www.w3.org/ns/prov#value | - harge means, cover means for covering the end of said annular wall remote from said base including a first substantially flat plate having an imperforate circumferential edge portion of size sufficient at least to close said channel and having a central portion with peforations therein, said central portion enclosing said cylindrical opening of said wall means to form a reaction chamber and to ret
|
