Of the U.S., Tonga or Canada, the one that never signed the Comprehensive Nuclear Test Ban Treaty
... Argentina, Australia, Austria, Bangladesh, Belgium, Brazil, Bulgaria, 
Canada,... [DOC] [TLE] List of parties to the Partial Nuclear Test Ban Treaty - Wikipedia [PAR] The list of parties to the Partial Test Ban Treaty encompasses the states who 
have signed and ... state authors (the Soviet Union, the United Kingdom, and the 
United States) signed the treaty that day.