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 6645-01-411-5657
NSN 7035-00-679-9027
NSN 6320-01-114-6054
NSN 5855-00-885-8452
NSN 5905-00-679-5923
NSN 5975-00-828-3505
NSN 6135-01-430-3119
NSN 5915-01-093-5227
NSN 5985-01-010-3398
NSN 5930-01-574-0235
NSN 5950-00-816-8428
NSN 5895-01-596-6996