ics/joints/B2Joint.html" class="type">B2Joint</a></dd>
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			 A line joint. This joint provides one degree of freedom: translation
  along an axis fixed in body1. You can use a joint limit to restrict
  the range of motion and a joint motor to drive the motion or to
  model joint friction.
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		<h2><a name="constructor_detail"></a>Constructor</h2>
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