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 5925-01-130-7486
NSN 6145-00-224-5245
NSN 6220-00-617-9616
NSN 5965-01-474-5654
NSN 2925-00-912-3993
NSN 5996-00-213-7121
NSN 6135-01-307-2749
NSN 5855-01-158-2709
NSN 5920-01-268-3791
NSN 6650-00-804-2039
NSN 6145-01-572-4430
NSN 5975-01-608-3852