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 5920-01-359-8720
NSN 6135-01-322-4655
NSN 5945-00-835-4200
NSN 6320-01-162-5977
NSN 6610-01-035-1252
NSN 5930-01-128-5743
NSN 6130-01-514-0108
NSN 2925-01-548-4875
NSN 5950-01-478-6049
NSN 4140-00-490-9028
NSN 5990-01-231-9608
NSN 6320-01-473-3848