import authorization or document automatically within five part shall have a printed guilloche-pattern background , ---pagebreak--- 29 . 8 . 86 Jornal Oficial das Comunidades Europeias N ? L 245 / 275making any falsification by mechanical or chemical means Article 18apparent to the eye . In order to ensure the proper application of the Agreement ,If the documents have several copies , only the top copy which the Community and Czechoslovakia shall assist each other inis the original shall be printed with the guilloche-pattern checking the authenticity and accuracy of export licences andbackground . This copy shall be clearly marked as 'original' certificates of origin issued or declarations made under thisand the other copies as 'copies'. Only the original shall be Protocol .clearly marked as 'original' and the other copies as 'copies'.Only the original shall be accepted by the competentauthorities in the Community as being valid for the purposes Article 19of export to the Community in accordance with thearrangements established by the Agreement . Czechoslovakia shall send the Commission of the European Communities the names and addresses of the governmental2. Each document shall bear a standardized serial authorities competent for the issue and verification of exportnumber , whether or not printed , by which it can be licences and certificates of origin , together with specimensidentified . of the stamps used by these authorities . Czechoslovakia shall also notify the Commission of any change in thisThis number shall be composed of the following elements : information .— a number indicating the quota year ,— numbers running from 00001 to 99999 allocated to the Article 20 country of destination ,