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 5855-01-138-4985
NSN 5915-01-548-9472
NSN 6130-01-142-6931
NSN 6320-01-506-9439
NSN 6110-00-229-5541
NSN 6145-01-104-5084
NSN 5910-01-099-9522
NSN 5855-01-650-9545
NSN 5996-00-210-8409
NSN 6685-01-314-6668
NSN 5925-01-196-9282
NSN 6135-01-434-6308