The inner arm is disposed between side arms of the outer arm.

The exciting arms, non-exciting arm, detecting arms, and non-detecting arm respectively consist of a piezoelectric.

Each secondary arm is interposed in an opening between the primary arms allowing the primary arms and the secondary arms to pass by each other through the openings without interfering with each other.

The distributing arms (30) comprise a first arm (31).

The reverse hinge acts such that when the proximal arms are moved apart, the distal arms are brought together.

The arms of the dummy shall be positioned symmetrically.

The short guide rods (21; 23) are hinged between the ends of the long guide rods (13; 19).

The load arms (24) are moveable, by an arm cylinder (27), relative to main arm (17).

The wheel-side fixing points of the both upper links and/or the lower links are preferably vertically offset from each other and neither the both upper links nor the lower transverse links and the (lower) longitudinal link describe a common plane.

The rigid ring slips over the arms, is retained by the bulges, and forces the arms together.

The master control arms and the slave arms can be mounted on the platform.

The side arms and cross-arms have flexible extrusions protruding from tips thereof.

The arms (209) can be radial.

The engagement means (38) also provide a frictional engagement between the first arms (10) and the mounting arms (32), thereby reducing the resilient characteristics required in the mounting arms.

The swivel arms consist in a long swivel arm (4) and a short swivel (5), each swivel arm being provided with a fixed implement holder (6).