| http://www.w3.org/ns/prov#value | - On each side of the push-button there is a seal substantially in the shape of an 8, one half of which frames a corresponding end of the internal passage of the push-button and, when the push-button is in the open position, the facing pipe section and whose other half frames an adjacent portion of the side of the push-button suitable for arranging itself in front of the same pipe section when the p
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