Mobara-shi(12210) and Honno-machi(12425) in Chosei-gun are merged, and Mobara-shi is newly established.

茂原市(12210)、本納町(12425)が合併し、茂原市を新設

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

http://data.e-stat.go.jp/lod/sac/C12210-19700501

http://data.e-stat.go.jp/lod/sac/C12210-19720501

http://data.e-stat.go.jp/lod/sac/C12425-19711201

http://data.e-stat.go.jp/lod/sac/C12425-19720501

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

1972-05-01 ^^http://www.w3.org/2001/XMLSchema#date