SECTION 12 — Notification, communication and time limits

12.1 All pleadings, correspondences and written communications exchanged by the parties, as well as documents annexed thereto, shall be furnished in as many copies as there are other parties plus one for each arbitrator and one for the Secretary General of the Court. However, the documents annexed may not be forwarded to the Secretary General except upon his request. 12.2 All pleadings, correspondences and communications from the Secretariat, the arbitrators or the parties are valid if they are: - delivered against a receipt, or - dispatched by registered mail to the address or last known address of the addressee, as given by him or by the other party as the case may be, or - by any means of communication with written proof, the original being considered as a authentic, in case of dispute 12.3 A notification or communication validly made shall be deemed to have been made on the day it was received by the interested party or by its representative. 12.4 The time limit prescribed by the present rules or by the Court in application of these rules or its internal rules starts running from the day following the date a notification or communication is deemed to have been made in accordance with the preceding paragraph. When the next day following such date is an official holiday, or a non business day in the country where the notification or communication is deemed to have been made, the time limit shall start to run on the first following business day. Official holidays and non- business days are included in the calculation of time limits and shall not prolong them. If the last day of the relevant time limit granted is an official holiday or a non- business day in the country where the notification or communication is deemed to have been made, the time limit shall expire at the end of the first following business day.