The location of the retail or service establishment, whether in an industrial plant, an office building, a railroad depot, or a government park, etc., will make no difference in the application of the exemption and such an establishment will be exempt if it meets the tests of the exemption. Generally, however, an establishment, wherever located, will not be considered a retail or service establishment within the meaning of the Act, if it is not ordinarily available to the general consuming public. An establishment, however, does not have to be actually frequented by the general public in the sense that the public must actually visit it and make purchases of goods or services on the premises in order to be considered as available and open to the general public. A refrigerator repair service shop, for example, is available and open to the general public even if it receives all its orders on the telephone and performs all of its repair services on the premises of its customers.