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 6685-01-592-5546
NSN 6135-00-866-2311
NSN 6135-00-194-9354
NSN 5855-01-325-9507
NSN 5965-01-279-8073
NSN 7035-01-512-0334
NSN 5910-00-121-7909
NSN 6145-01-210-7992
NSN 5925-00-490-9852
NSN 4140-01-217-6290
NSN 7035-00-104-7613
NSN 5895-01-480-4087