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 6610-01-468-0679
NSN 5920-01-167-8869
NSN 6320-00-228-5678
NSN 6685-01-316-0748
NSN 6685-01-162-5075
NSN 6240-01-262-4490
NSN 6150-00-679-9203
NSN 5920-01-391-9008
NSN 5990-01-027-1869
NSN 5945-01-410-6804
NSN 6150-00-805-0808
NSN 6240-01-521-5982