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 5996-01-129-6422
NSN 5925-01-559-2836
NSN 5975-01-221-8180
NSN 6220-00-383-9402
NSN 6240-00-858-0389
NSN 5945-01-632-2874
NSN 5855-01-400-1590
NSN 5920-01-188-0048
NSN 5950-01-474-3749
NSN 5985-01-631-3956
NSN 6110-01-660-0340
NSN 6610-00-006-1489