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17U.K.For the purposes of this Schedule—
(a)issue is joined on a notice of opposition to the grant of a patent under section 14 of the 1949 Act when the applicant for the patent files a counter-statement fully setting out the grounds on which the opposition is contested;
(b)issue is joined on an application for the revocation of a patent under section 33 of that Act when the patentee files a counter-statement fully setting out the grounds on which the application is contested.