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 5835-00-778-5761
NSN 5975-00-863-3860
NSN 6105-01-640-8017
NSN 5935-01-141-7500
NSN 6645-01-421-6909
NSN 6145-01-185-0294
NSN 5990-01-031-7599
NSN 6130-01-038-4537
NSN 6650-01-494-2084
NSN 5965-01-126-4178
NSN 6685-01-634-0611
NSN 6320-01-242-8355