| http://www.w3.org/ns/prov#value | - As can be seen in FIG. 2, each of the locking and unlocking means 15 comprises an arm 17 mounted in fixed manner on the top web 12 of the moving rail 7 which is associated with said arm, e.g. by riveting or welding, and an actuating element or lever 18 mounted to pivot on the arm 17 about a first transverse axis Yl.
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