Impression means an imprint or negative likeness of teeth and/or other tissues of the oral cavity from which a positive reproduction may be made.
Permanent radiographic installation means an enclosed shielded room, cell, or vault, not located at a temporary jobsite, in which radiography is performed.
Dielectric material means a material that does not conduct direct electrical current. Dielectric coatings are used to electrically isolate UST systems from the surrounding soils. Dielectric bushings are used to electrically isolate portions of the UST system (e.g., tank from piping).
Loose-fitting facepiece means a respiratory inlet covering that is designed to form a partial seal with the face.
Genetic material means any material of plant, animal, microbial or other origin containing functional units of heredity.