| http://www.w3.org/ns/prov#value | - ? delimited along the perimeter or outer edge of the wall 15B is apt to receive a suitable sealing element, such as a gasket indicated with 16 in FIG. 2. [0049] Two extensions 15C??? are delimited on the front surface of the front wall 15C, each one of them having a relief or pin 15C???; the front wall 15C also has a protruding portion PA, designed like a lead, being apt to obtain a sort of recess
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