September 3, 2004 Added images nos. 9 - 17 to "Teikoku Kenpo Kaiseian" in "4-9 Amendments in the House of Representatives Subcommittee, July 27 to 29, 1946".
November 18, 2005 Added text-data of English documents.
March 6, 2006 Achieved a liquid layout and made link to Database System for the Minutes of the Imperial Diet (Japanese only).
March 21, 2013 Character code and metatag were renovated.
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