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 6150-00-967-3351
NSN 5945-01-256-6178
NSN 7035-01-332-2304
NSN 6620-00-858-7317
NSN 6145-01-498-6499
NSN 5920-01-419-7737
NSN 5855-00-117-0857
NSN 5895-01-047-0233
NSN 5835-01-373-9506
NSN 5990-01-254-3197
NSN 5835-01-536-6241
NSN 5925-01-241-0567