| http://www.w3.org/ns/prov#value | - contact and the passageways are in fluid communication; and a key coding system including matched pairs of intermitting annular grooves and annular keys, each groove-and-key-pair constituting a separate code whereby the system provides a plurality of codes, there being one of said annular grooves in one of the coupling ends and circumscribing its passageway, there being one of said annular keys in
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