1969—
Pub. L. 91–172 redesignated existing provisions as subsec. (a) and added subsec. (b).
Amendment by
Pub. L. 91–172 applicable with respect to sales made after Dec. 19, 1969, see section 201(g)(6) of
Pub. L. 91–172, set out as a note under section
170 of this title.