B30.20 includes provisions that apply to the marking, construction, installation, inspection, testing, maintenance, and operation of below-the-hook lifting devices, other than slings, used for attaching loads to hoists, including: Structural and Mechanical Devices; Vacuum Lifting Devices; Close Proximity Operated Lifting Magnets; Remotely Operated Lifting Magnets; and Scrap and Material Handling Grapples
ASME B30.20 Interpretations-1993 history
2012ASME B30.20 INTERPRETATIONS-2012 Interpretations to B30.20 - Below-The-Hook Lifting Devices (Includes Interpretations Through May 2012)