In 1909, Western Union and ADT came under the control of American Telephone & Telegraph Company (AT&T). ADT began to expand into new areas, such as fire alarms and security alarms between 1910 and 1930, but was kept separate from AT&T's Holmes alarm business. ADT became a publicly owned company in the 1960s.
It has moist membranes. Many, but not all (urinary), secrete mucous. Serous: Lines open body cavities that are closed to the exterior body surface. composed of simple squamous epithelium resting on thin layer of areolar connective tissue.
endothelia [Gr.] the layer of epithelial cells that lines the cavities of the heart and of the blood and lymph vessels, sometimes applied to other internal epithelial surfaces. corneal endothelium. lines the inner surface of the cornea, between the corneal stroma and aqueous humor; called also the posterior epithelium.enÂ·doÂ·theÂ·liÂ·um/ (-theÂ´le-um) pl. endotheÂ´lia the layer of epithelial cells that lines the cavities of the heart, the serous cavities, and the lumina of the blood and lymph vessels.