(Based upon the complaint, Form 16) United States District Court for the Southern District of New York Civil Action, File Number XX A. B., plaintiff    v.  Motion to inter- C. D., defendant W  vene as a E. F., applicant for   defendant  intervention E. F. moves for leave to intervene as a defendant in this action, in order to assert the defenses set forth in his proposed answer, of which a copy is hereto attached, on the ground that he is the manufacturer and vendor to the defendant, as well as to others, of the articles alleged in the complaint to be an infringement of plaintiff’s patent, and as such has a defense to plaintiff’s claim presenting both questions of law and of fact which are common to the main action.^[1] Signed: XXXXXXXXXXXXXX, Attorney for E. F., Applicant for Intervention. Address: XXXXXXXXXXXXX Notice of Motion (Contents the same as in Form 19) United States District Court for the Southern District of New York Civil Action, File Number XX A. B., plaintiff    v. C. D., defendant W Intervener’s Answer E. F., intervener First Defense Intervener admits the allegations stated in paragraphs 1 and 4 of the complaint; denies the allegations in paragraph 3, and denies the allegations in paragraph 2 in so far as they assert the legality of the issuance of the Letters Patent to plaintiff. Second Defense Plaintiff is not the first inventor of the articles covered by the Letters Patent specified in his complaint, since articles substantially identical in character were previously patented in Letters Patent granted to intervener on January 5, 1920. Signed: XXXXXXXXXXXXXXXX, Attorney for E. F., Intervener. Address: XXXXXXXXXXXXXXX

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[1] For other grounds of intervention, either of right or in the discretion of the court, see Rule 24 (a) and (b).