| http://www.w3.org/ns/prov#value | - Preferred forms of the invention are shown in the drawings, in which Fig. l is a partial sectional elevation of the front portion of a projected device; Fig. 2 is an enlarged detail section of the extreme front end of said device; Fig. 3 is a view similar to Fig. 2 butshowing a modified construction; Fig. 4 is a fragmentary sectional view of a portion of the side wall of the projected device and s
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