Usuki-shi(44206) and Notsu-machi(44421) in Ono-gun are merged, and Usuki-shi is newly established.

臼杵市(44206)、野津町(44421)が合併し、臼杵市を新設

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http://data.e-stat.go.jp/lod/terms/sacs#CodeChangeEvent

http://data.e-stat.go.jp/lod/sac/C44206-19700401

http://data.e-stat.go.jp/lod/sac/C44206-20050101

http://data.e-stat.go.jp/lod/sac/C44421-19780101

http://data.e-stat.go.jp/lod/sac/C44421-20050101

http://data.e-stat.go.jp/lod/sacr/establishmentOfNewMunicipalityByMerging

2005-01-01 ^^http://www.w3.org/2001/XMLSchema#date