News editors obtained the following quote from the background information suppli ed by the inventors: “ “This disclosure relates to a conveyance system and a conveyance method. “Japanese Unexamined Patent Application Publication No. 11-29207 (JP 11-29207 A) describes a cargo transfer apparatus including a hook engageable with an engage d portion of a container, and the cargo transfer apparatus moves the container w ith the hook being engaged with the engaged portion.” As a supplement to the background information on this patent application, NewsRx correspondents also obtained the inventors’ summary information for this patent application: “According to the technology described in JP 11-29207 A, there is such a problem that an operator might continue an operation without noticing tha t the hook is not engaged with the engaged portion of the container, and goods m ight drop during the operation.