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.
Simple squamous epithelia are seen in many places but mesothelium and endothelium are the most ubiquitous types. Mesothelium is the term applied to the simple squamous epithelium that lines the four coelom-derived cavities: two pleural, pericardial and peritoneal.his epithelium has a thick basement membrane that is a characteristic of the respiratory epithelium. Look for cilia and goblet cells. Cilia may be seen to better advantage in slide 125, a 1.5 thick plastic section of a monkey trachea or large bronchus. Consult your text or atlas for details of their fine structure.