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 5855-01-300-7424
NSN 4140-01-486-6094
NSN 6645-01-539-5922
NSN 5975-00-009-7020
NSN 6130-00-596-9565
NSN 6685-01-087-2577
NSN 7035-00-616-4410
NSN 5855-01-534-6449
NSN 5905-01-406-3485
NSN 4140-00-231-1475
NSN 6145-01-286-4343
NSN 2925-01-016-3111