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 5950-00-939-0401
NSN 6610-01-224-7247
NSN 5910-01-644-1562
NSN 5925-01-142-1996
NSN 5985-00-683-5592
NSN 5905-01-476-1325
NSN 7035-01-484-7878
NSN 6110-01-084-4215
NSN 6150-01-093-3434
NSN 5930-01-634-0659
NSN 6645-00-803-6417
NSN 5990-01-184-6830