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 5855-01-007-9541
NSN 5990-01-294-6198
NSN 5930-01-459-9269
NSN 5965-01-518-8194
NSN 6620-01-319-9804
NSN 6145-01-391-4113
NSN 5835-01-074-7593
NSN 5835-00-020-0443
NSN 6130-01-218-5682
NSN 5925-00-456-0651
NSN 5975-00-217-4910
NSN 6150-00-001-2459