In all cases where two or more retail liquor permit premises are in common or cooperative ownership, or where a majority of the capital stock having voting privileges of corporations owning together two or more retail liquor permit premises is held by the same person or persons, the permittees thereof may transfer any alcoholic liquor from one such retail premise to another such retail premise, for the purpose of inventory equalization or other business convenience, except when such permittee is a delinquent retailer as said term is used in subsection (b) of section 30-48.