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.
The mucous membranes line internal body cavities that open to the outside world. In particular, three major tracts through the body are lined with mucous membranes: the digestive tract, the respiratory tract, and the urogenital tract. All of the mucous membranes are moist membranes. Most secrete mucous,