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Guide for applicants, Part 1: How to get a European patent

Where and how to file
After you have filed a European patent application, you may file other documents as referred to in Rule 50 EPC with the EPO in Munich, The Hague or Berlin, either electronically, using the EPO's Online filing software, by hand or by post. The EPO provides forms which serve either as a prepared acknowledgement of receipt (Form 1037) or as letter accompanying subsequently filed documents (Form 1038).
OJ 2009,182
You may also file documents (other than authorisations and priority documents) by fax. Documents may not be filed by e-mail, on diskette, or by teletex, telegram, telex or similar means. 
OJ 2012, 348
If you filed the application with a national authority, you may likewise file all other documents relating to the application with that authority, subject to any restrictions under national law, but only until the date on which you receive notification that the EPO has received your application. Once you have received this notification, you must file any such documents with the EPO directly.