The Act specifies the maximum period during which the right of
inspection of membership lists is to be granted. The opportunity to
inspect the lists must be granted once during the 30-day period prior to
the casting of ballots in the election. Thus, where a mail ballot system
is employed under which ballots are returnable as soon as received by
members, the right to inspect must be accorded within the 30-day period
prior to the mailing of the ballots to members. It would be an
unreasonable restriction to permit inspection of lists
only after the ballots have been mailed or the balloting has commenced.