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The research vessel (RV) Investigator was operated by CSIRO, Australia's national science agency.
The Governors of Tripura, Gujarat and Nagaland on Thursday called on Prime Minister Narendra Modi.
Ramesh Bais, Acharya Devvrat and R N Ravi were recently appointed as Governors of Tripura, Gujarat and Nagaland respectively.
Devvrat was earlier the Governor of Himachal Pradesh
The Prime Minister's Office posted on Twitter pictures of the three meetings Modi separately.
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