Seamless and welded steel tubes. Part 11. Automated ultrasonic testing of the weld seam for the detection of longitudinal and/or transverse imperfections
Occupational safety standards system. Personal protective equipment against falls from a height. Rescue lifting devices. General technical requirements. Test methods
Digital paths of the initial distribution of programs of a sound broadcasting, organized by fiber optical, satellite, radiorelay and cable systems of transfer. Terms and definitions. Structure. Basic parameters. Methods of measurement
