| http://www.w3.org/ns/prov#value | - ingly slideable in the reservoir, and an elongate, horizontally extending opening or other opening or openings in the bottom of the reservoir forming outlet means and pressure reduction means for the viscous material as it is urged downwardly by the piston, and in which the peripheral side of said opening or openings is of flexible material and extends downwardly and forms a sealing surface of fle
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