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Guide for applicants, Part 2: PCT procedure before the EPO (Euro-PCT Guide)

Filing further documents
After an international application has been filed other documents may be filed in any proceedings before the EPO direct, by post or - with the exception of authorisations and priority documents - by fax at the EPO filing offices.  
OJ 2007, Spec.Ed.3, A.3
No confirmation copy of a further document must be filed, but the receiving Office may require a confirmation copy to be submitted (see point 71), which it will do in particular if the applicant has submitted substitute sheets under Rule 26 PCT and/or any sheets to be incorporated by reference under Rule 20.6 PCT. In these two cases the applicant is advised to submit a confirmation copy on his own initiative directly after sending the sheets concerned by fax.