A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5965-01-482-0235
NSN 6145-01-194-1601
NSN 5915-00-659-3107
NSN 6620-01-552-4980
NSN 5935-01-435-4085
NSN 5950-00-225-8557
NSN 6610-00-170-6715
NSN 6220-01-239-1391
NSN 4140-01-241-1421
NSN 5950-01-113-7834
NSN 6145-01-099-2682
NSN 6620-00-816-9755