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.
2. Serous Membranes of the GI. Most of the organs of the GI are covered by serous membranes that line the body cavities and cover the organs that lie within these cavities..  These membranes secrete fluid that moistens the cavity containing the abdominal viscera.