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 5855-01-394-3688
NSN 5895-01-426-8942
NSN 4140-01-026-9293
NSN 7035-01-598-0241
NSN 6685-00-663-9000
NSN 5915-01-113-0393
NSN 5855-01-372-1622
NSN 6645-01-243-0468
NSN 5910-01-474-6606
NSN 6620-00-555-3992
NSN 5975-01-120-1088
NSN 6150-01-011-3937