| http://www.w3.org/ns/prov#value | - in an initial state, a positive initial volume of usable material (50, 50 c, 50 d) occupies said usable material chamber (46) and a non-negative initial volume of displacement matter (50, 50 c, 50 d) is introduced into said displacement matter chamber (48) so as to substantially fill said device and substantially remove atmospheric air from said device and particularly from contact with said usabl
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