Upon receipt of a demand, or a copy thereof, from the International Preliminary Examining Authority, the International Bureau shall promptly transmit to that Authority:

(i) a copy of the written opinion established under Rule 43bis.1, unless the national Office or intergovernmental organization that acted as International Searching Authority is also acting as International Preliminary Examining Authority; and
(ii) a copy of any amendment under Article 19, and any statement referred to in that Article, and the letter required under Rule 46.5(b), unless that Authority has indicated that it has already received such a copy.

If, at the time of filing any amendments under Article 19, a demand has already been submitted, the applicant shall preferably, at the same time as he files the amendments with the International Bureau, also file with the International Preliminary Examining Authority a copy of such amendments, and any statement referred to in that Article and the letter required under Rule 46.5(b). In any case, the International Bureau shall promptly transmit a copy of such amendments statement and letter to that Authority.

(a) Upon request of the International Preliminary Examining Authority, the written opinion established under Rule 43bis.1 shall, when not in English or in a language accepted by that Authority, be translated into English by or under the responsibility of the International Bureau.
(b) The International Bureau shall transmit a copy of the translation to the International Preliminary Examining Authority within two months from the date of receipt of the request for translation, and shall at the same time transmit a copy to the applicant.
(c) The applicant may make written observations as to the correctness of the translation and shall send a copy of the observations to the International Preliminary Examining Authority and to the International Bureau.

(a) Subject to paragraph (b), when amending the description or the drawings, the applicant shall be required to submit a replacement sheet for every sheet of the international application which, on account of an amendment, differs from the sheet previously filed. The replacement sheet or sheets shall be accompanied by a letter which shall draw attention to the differences between the replaced sheets and the replacement sheets, shall indicate the basis for the amendment in the application as filed and shall preferably also explain the reasons for the amendment.
(b) Where the amendment consists in the deletion of passages or in minor alterations or additions, the replacement sheet referred to in paragraph (a) may be a copy of the relevant sheet of the international application containing the alterations or additions, provided that the clarity and direct reproducibility of that sheet are not adversely affected. To the extent that any amendment results in the cancellation of an entire sheet, that amendment shall be communicated in a letter which shall preferably also explain the reasons for the amendment.
(c) When amending the claims, Rule 46.5 shall apply mutatis mutandis. The set of claims submitted under Rule 46.5 as applicable by virtue of this paragraph shall replace all the claims originally filed or previously amended under Articles 19 or 34, as the case may be.