As originally enacted, subsec. (b) contained a reference to the Supreme Court of the District of Columbia. Act June 25, 1936, substituted “the district court of the United States for the District of Columbia” for “the Supreme Court of the District of Columbia”, and act June 25, 1948, as amended by act May 24, 1949, substituted “United States District Court for the District of Columbia” for “district court of the United States for the District of Columbia”.

1972—Subsecs. (a), (b). Pub. L. 92–576 inserted references to the Board.

Amendment by Pub. L. 92–576 effective 30 days after Oct. 27, 1972, see section 22 of Pub. L. 92–576, set out as a note under section 902 of this title.