[1]

MIME	Content-Convert:	変換情報	IETF提案標準, IANA 未登録	RFC 4141
MIME	Content-Previous:	変換前の特徴	IETF提案標準, IANA 未登録	RFC 4141

[2] rfc4141, 2021-07-14T03:32:56.000Z https://datatracker.ietf.org/doc/html/rfc4141

[3] RFC Errata Report » RFC Editor, 2021-07-14T03:36:30.000Z https://www.rfc-editor.org/errata_search.php?rfc=4141&rec_status=0