| http://www.w3.org/ns/prov#value | - The neck joint unit 280 includes a rotary joint 281 in the yaw direction (rotated around the z-axis), a rotary joint 282 in the pitch direction (rotated around the y-axis), and a rotary joint 283 in the roll direction (rotated around the x-axis), and thus has 3 degrees of freedom.Motors (for example, actuators, such as electric motors or hydraulic motors) to rotate the head 104 are connected to th
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