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 6685-01-485-3110
NSN 5990-01-443-2931
NSN 6105-00-465-7018
NSN 6610-01-204-7281
NSN 5895-00-205-2924
NSN 6650-01-386-6711
NSN 6220-01-379-6692
NSN 6240-00-452-5241
NSN 5950-00-051-3709
NSN 6145-01-411-6454
NSN 5990-00-007-5170
NSN 6240-00-557-4402