Stress relief annealed
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 5915-01-138-1110
NSN 5910-01-147-8802
NSN 5965-01-386-2988
NSN 6645-00-067-7070
NSN 5960-01-119-4609
NSN 6105-01-462-6082
NSN 5930-01-108-6857
NSN 5950-00-138-1656
NSN 5998-01-104-5964
NSN 5915-01-322-3892
NSN 6610-00-152-7216
NSN 2925-01-368-5773