A mobile crane includes a chassis having first connection features located on a rear end thereof. A method for manufacturing a highly reliable light-emitting module is provided. In various embodiments the method may include reversing the frequency content of an input signal, converting the reversed signal into interleave artifact content, delaying the input signal along a parallel path, and then subtracting the interleave content from the delayed input signal. The persistent Web servers receive URLs containing a time stamp, extract the time stamp, retrieve the correct Web page from the archive, and return the requested page to the client. The tapered gap is arranged closer to the central axis than a radially outermost point of the wall surface. Audible and visual indicators of the faultstatus and wavelength are provided.