DIN EN 2155-8:1989-11 Aerospace series; test methods for transparent materials for aircraft glazing; part 8: determination of optical distortion; german version EN 2155-8:1989
1989DIN EN 2155-8:1989-11 Aerospace series; test methods for transparent materials for aircraft glazing; part 8: determination of optical distortion; german version EN 2155-8:1989
1989DIN EN 2155-8:1989 Aerospace series; test methods for transparent materials for aircraft glazing; part 8: determination of optical distortion; german version EN 2155-8:1989