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Rule-58

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58. Filing of reply statement and evidence.—

(1) If the patentee desires to contest the opposition, he shall leave at the appropriate office a reply statement setting out fully the grounds upon which the opposition is contested arid evidence, if any, in support or his case within a period of two months from "the date of receipt of the copy of the written statement and Opponent's evidence, if any by mm under rule 5 and deliver to the opponent a copy thereof.

(2) If the patentee does not desire to contest or leave his reply and evidence within the period as specified in sub-rule (1), the patent shall be deemed to have been revoked.