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 skin is a type of membrane that protects the body from invading pathogens. There are five types of membranes found within the body. Membranes are flat sheets of tissue that cover or line parts of the body and are typically composed of epithelial cells and connective tissue. Epithelial cells cover the inner and outer layers of surfaces and form glands that secrete fluids.