50 صفحه pdfASME B30.8:2015Floating Cranes and Floating DerricksSafety Standard for Cableways, Cranes Derricks, Hoists, Hooks, Jacks, and Slings
ASME B30.8:2015
50 صفحه pdfASME B30.8:2015Floating Cranes and Floating DerricksSafety Standard for Cableways, Cranes Derricks, Hoists, Hooks, Jacks, and Slings