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 5975-01-111-9988
NSN 6645-01-528-7152
NSN 5990-01-460-6390
NSN 5990-01-491-1397
NSN 6145-01-169-3001
NSN 2925-00-265-7539
NSN 5945-00-631-3565
NSN 5905-01-570-2083
NSN 5945-00-223-1064
NSN 6685-00-505-5470
NSN 5915-01-429-9287
NSN 5905-01-417-4214