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(2) a knuckle pin or kingpin (2) having an anchoring portion (3) to be fixed to a chassis (3a) of a semi-trailer and a head (8) projecting downwards relative to a rest plane (p) of the semi-trailer, and suitable for operative engagement by a fifth wheel (fw) carried by a tractor;
1.2 einem in einem gehäuse (3) angeordneten und von einer ent- in eine verriegelungsstellung und umgekehrt verschiebbaren sperrbolzen (6) mit den merkmalen: