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 5985-01-269-4083
NSN 5915-01-369-6030
NSN 5990-01-115-5859
NSN 5930-00-594-9442
NSN 6685-01-069-4336
NSN 5985-01-310-2964
NSN 6130-00-535-4494
NSN 5965-00-985-9157
NSN 6620-01-659-6697
NSN 5920-00-203-5938
NSN 6105-01-081-2041
NSN 6105-01-390-8849