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 6645-00-215-0102
NSN 6135-00-951-3426
NSN 6685-00-864-4729
NSN 6220-01-181-7117
NSN 2925-01-099-7075
NSN 6150-01-360-7204
NSN 5998-01-554-4892
NSN 7035-01-627-3070
NSN 5998-01-186-3705
NSN 5920-01-160-4351
NSN 5950-01-502-7333
NSN 5950-01-442-5484