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 5905-00-816-9679
NSN 6650-01-459-8575
NSN 5975-01-266-3582
NSN 6240-00-467-7295
NSN 5920-00-949-7321
NSN 6645-00-012-5834
NSN 6685-00-410-3369
NSN 6220-01-502-5329
NSN 5950-00-013-1236
NSN 5835-01-013-9321
NSN 2925-01-364-7926
NSN 6145-00-921-7990