a composition for film formation which can be cured in a short time period and give a film having a low dielectric constant and excellent in heat resistance, adhesion and cracking resistance, a polymer for use in the composition and a process for producing the polymer. The thermo-resistant handles may be connected to the rods using thermo-resistant connectors. An event detector, such as a vibration sensor or distance measuring radar, is further installed on a second HE that is a tractor with an attached chassis for receiving and transporting a container.