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 5915-01-653-0627
NSN 5960-00-915-6269
NSN 5925-01-365-5442
NSN 6645-00-075-4764
NSN 5985-01-123-9484
NSN 5985-01-212-2950
NSN 6320-00-882-7061
NSN 5990-01-506-7695
NSN 6685-01-437-4305
NSN 5915-00-261-9970
NSN 6685-01-362-6385
NSN 6610-01-369-4212