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 6320-00-546-9249
NSN 6610-01-331-6966
NSN 5985-00-552-2507
NSN 5915-00-911-2760
NSN 6645-01-442-6476
NSN 5945-01-152-7539
NSN 5950-01-285-5644
NSN 5920-01-020-7659
NSN 6685-00-204-6037
NSN 6150-01-132-2487
NSN 5930-01-617-3369
NSN 5945-01-477-9250