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 6130-01-212-9912
NSN 6620-00-455-2405
NSN 6130-01-133-6329
NSN 5999-01-311-3217
NSN 6130-01-212-3832
NSN 6320-01-514-6141
NSN 4140-00-289-9263
NSN 6320-01-185-3857
NSN 5895-01-145-5358
NSN 6105-00-296-0372
NSN 6610-01-076-3412
NSN 5905-00-256-0130