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 2925-01-300-2897
NSN 5915-01-474-4210
NSN 5985-01-581-5554
NSN 5905-01-580-1712
NSN 6320-01-255-2096
NSN 5895-00-648-9549
NSN 6685-01-372-5602
NSN 6130-00-877-5743
NSN 5950-01-411-1880
NSN 6650-00-759-8905
NSN 5835-01-058-1063
NSN 6130-00-102-4521