What reference source contains technical lifting data for permanent overhead cranes?

The correct choice is Thomas' Register, which is a comprehensive directory of industrial products and suppliers. It includes detailed information about various equipment and machinery, including technical lifting data for permanent overhead cranes. This resource is particularly valuable for contractors and engineers looking to understand the specifications, capacities, and applications of different types of lifting equipment.

Choosing Thomas' Register allows users to access a wide range of manufacturers and their offerings, making it easier to find specific technical data related to overhead cranes, which are crucial in construction and manufacturing settings. This data can be pivotal in ensuring that the right equipment is selected for specific lifting tasks, ensuring safety and efficiency on job sites.

Other sources listed may provide useful industry information but do not focus specifically on technical lifting data for cranes. For example, the Construction Specifications Institute primarily focuses on standards for construction documentation and specifications, while the American Society for Testing Materials relates more to material testing standards rather than specific equipment. Underwriters Laboratories is known for product safety testing and certification but does not typically serve as a primary resource for technical lifting data.