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 6220-01-067-8142
NSN 5998-01-467-2565
NSN 5985-00-399-1174
NSN 5945-00-964-7361
NSN 4140-01-061-6944
NSN 5965-01-252-8701
NSN 5835-01-147-7526
NSN 5975-01-103-5397
NSN 6145-01-465-5533
NSN 2925-00-435-5604
NSN 2925-01-619-4825
NSN 5950-01-167-0825