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 6240-01-463-8217
NSN 5910-00-144-4383
NSN 6610-01-441-1581
NSN 6685-01-113-4470
NSN 5915-00-627-1129
NSN 6610-01-608-5285
NSN 5965-01-560-8572
NSN 6645-00-153-3834
NSN 5895-00-186-0717
NSN 5905-00-491-6577
NSN 5930-01-446-4548
NSN 6220-01-519-9305