Civil Procedure
Section 4. Dismissal of counterclaim, cross-claim, or third-party complaint. - The provisions of this Rule shall apply to the dismissal of any counterclaim, cross-claim, or third-party complaint. A voluntary dismissal by the claimant by notice as in section 1 of this Rule, shall be made before a responsive pleading or a motion for summary judgment is served or, if there is none, before the introduction of evidence at the trial or hearing. (4a)