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 6150-00-991-0860
NSN 5945-01-410-8181
NSN 6320-00-322-3460
NSN 6645-01-592-7862
NSN 6685-01-173-7866
NSN 5975-00-541-8531
NSN 2925-00-261-5800
NSN 6145-01-379-6123
NSN 6130-01-628-6908
NSN 2925-00-278-9468
NSN 6110-01-556-1421
NSN 6620-01-046-8623