| http://www.w3.org/ns/prov#value | - bag extends outside the chamber, said housing including clamping means adjacent said opening for covering the opening and for clamping the bag adjacent the precursor-containing cells in said chamber for isolating said precursor-containing cells in said chamber apart from the remainder of the bag; and means in said chamber for rupturing the frangible cells and mixing said foam precursors while the
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