| http://www.w3.org/ns/prov#value | - It comprises a cylindrical body 41, which is extended on the side opposite to its face 42 which strikes the entrance interface 9a of the waveguide, of which it is possible to see the part 4b, by a thin annular skirt 43, which is notched at 44 and 45 in such a manner as to form a spring.
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