| http://www.w3.org/ns/prov#value | - Forming a seal between bases 15a and 15b and the contents 16a and 16b of containers 14a and 14b is a spacer member 27a and 27b, respectively, which is fitted slidably (in an upward direction only) in the bottom of containers 14a and 14b, respectively, and which maintains the cavity formed between it and the upper surface of the containers filled with the contents thereof as in
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