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 5920-00-915-1206
NSN 5985-00-199-3891
NSN 6220-01-270-9885
NSN 5915-00-959-5454
NSN 5895-01-378-6779
NSN 5905-00-167-6872
NSN 5960-01-010-8787
NSN 6150-01-144-5982
NSN 5965-00-244-8428
NSN 5920-00-681-6464
NSN 6320-00-456-2092
NSN 6685-01-195-5354