| http://www.w3.org/ns/prov#value | - of the said spring, a cage (35) with a form adapted so as to slide inside the guide tube (13), and to house the piston rod (7) and the collar (9) thereof, the said cage including towards one of its ends, the rear end, an internal device (41) for locking the collar (9) of the piston rod (7), capable of deforming radially and, towards its other forward end, a front wall (38) for stopping the propuls
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