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 6130-00-755-7060
NSN 6650-01-493-3093
NSN 5915-01-505-8202
NSN 4140-01-146-5409
NSN 5960-01-391-1308
NSN 7035-01-480-5537
NSN 5965-01-140-9446
NSN 5965-00-057-6944
NSN 2925-00-149-0760
NSN 6110-00-973-8378
NSN 6685-01-435-4366
NSN 5855-01-415-3987