§ 386.15 was not in the regulations on October 1, 1997.
It exists today (in force since October 1, 1999). Versions on file run from Oct. 1, 1999 to present.
Amendment history
1 distinct wording on file since Oct. 1, 1999- Oct. 1, 1999 → presentannual editions 1999–2016
A new entry appears whenever the regulatory words change between government snapshots. Day-precise from the eCFR (2017 onward); before that, one snapshot per annual CFR edition (revised as of October 1). Bracketed citations are the Federal Register history printed with the section.