(a) The unit store ordinarily will constitute the establishment contemplated by the exemptions. The mere fact that a store is departmentalized will not alter the rule. For example, the typical large department store carries a wide variety of lines which ordinarily are segregated or departmentalized not only as to location within the store, but also as to operation and records. Where such departments are operated as integral parts of a unit, the departmentalized unit taken as a whole ordinarily will be considered to be the establishment contemplated by the exemptions, even if there is diversity of ownership of some of the departments, such as leased departments.
(b) Some stores, such as bakery or tailor shops, may produce goods in a back room and sell them in the adjoining front room. In such cases if there is unity of ownership and if the back room and the front room are operated by the employer as a single store, the entire premises ordinarily will be considered to be a single establishment for purposes of the tests of the exemption, notwithstanding the fact that the two functions of making and selling the goods, are separated by a partition or a wall. (See H. Mgrs. St., 1949, p. 27.)