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 5950-01-071-6684
NSN 4140-01-245-8866
NSN 5975-01-119-8454
NSN 2925-00-876-1578
NSN 6320-00-539-9283
NSN 5895-00-270-6595
NSN 5855-01-645-5384
NSN 6130-01-150-4450
NSN 5999-00-765-7078
NSN 5905-01-656-5751
NSN 5925-00-114-2253
NSN 5925-01-039-3764