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 6685-01-064-6518
NSN 5999-01-519-9353
NSN 5950-01-193-8678
NSN 5925-00-348-3591
NSN 6135-00-891-4944
NSN 6620-00-038-5343
NSN 5985-00-754-5426
NSN 5855-00-361-0167
NSN 5998-01-654-7008
NSN 5945-01-066-2880
NSN 5910-01-571-7281
NSN 5950-01-301-4824