Computer network means the interconnection of hardwire or wireless communication lines with a computer through remote terminals, or a complex consisting of 2 or more interconnected computers.
Voice mail service means an ancillary service that enables the customer to store, send or receive recorded messages. Voice mail service does not include any vertical services that the customer may be required to have in order to utilize the voice mail service.
Cabinet x-ray system means an x-ray system with the x-ray tube installed in an enclosure independent of existing architectural structures except the floor on which it may be placed. The cabinet x-ray system is intended to contain at least that portion of a material being irradiated, provide radiation attenuation, and exclude personnel from its interior during generation of radiation. Included are all x-ray systems designed primarily for the inspection of carry-on baggage at airline, railroad, and bus terminals, and in similar facilities. An x-ray tube used within a shielded part of a building, or x-ray equipment that may temporarily or occasionally incorporate portable shielding, is not considered a cabinet x-ray system.
Loose-fitting facepiece means a respiratory inlet covering that is designed to form a partial seal with the face.
Added filtration means any filtration which is in addition to the inherent filtration.