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.
flat sheets of pliable tissue that cover or line a part of the body. The combination of an epithelial connective tissue layer constitutes an epithelial membrane. Another kind of membrane, a synovial membrane, lines the joint cavities and contains connective tissue but no epithelial layer.