The oldest one would probably be the Rada of the Belarusian Democratic Republic [1] which went into exile in 1919 and unlike similar bodies from other ex-Soviet republics remained apart after 1991.
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And Terra Nova Tel which provided phone service in parts of Newfoundland was built on the legacy of the former Dominion of Newfoundland Department of Posts and Telephones by Canadian National while the latter was still a federal crown corporation.
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