Treaty Series No. 13 (1982). Amendments to the regulations under the Patent Co-operation Treaty done at Washington 19 June 1970 adopted by the Assembly of the International Patent Co-operation Union on 3 July 1981 [electronic resource].
- Cambridge [eng.] : Proquest LLC, 2007.
- Government document
1 online resource (4 p.: Table).
- [1981/82] ; Cmnd. 8502
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