A bridge positioned between two parts, such as a nozzle support pipe envelope and a heat shield liner, includes a central part with inversed curvature thus having two contact zones with the nozzle support pipe envelope. The tubular conductive wire mesh is typically formed from wire using knitting, weaving, or similar process. Thus, advantages in both the high displaying quality of a large screen and excellent portability of a small-sized hand-held electronic device can be attained. Until the acknowledgment is received, multicast traffic that is received via the new multicast tree can be dropped.