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 6240-01-422-3461
NSN 5950-01-415-5752
NSN 5835-00-286-5432
NSN 6240-01-328-0718
NSN 5915-01-144-1602
NSN 4140-01-138-2228
NSN 5855-00-237-4088
NSN 6135-01-579-3534
NSN 5855-01-075-1292
NSN 6320-01-340-4112
NSN 5965-01-515-9326
NSN 5985-00-817-3742