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The European Patent Convention


Article 166

This Convention shall be open to accession by: 
the States referred to in Article 165, paragraph 1;
any other European State at the invitation of the Administrative Council. 
Any State which has been a party to the Convention and has ceased to be so as a result of the application of Article 172, paragraph 4, may again become a party to the Convention by acceding to it.
Instruments of accession shall be deposited with the Government of the Federal Republic of Germany. 

Art. 35, 178