The invention provides a cleaning blade member having a controlled friction coefficient and a method for producing the same. A server stores reference audio signal fingerprints, each associated with a reference audio signal of the program. When the vacuum section includes a gas and liquid contact chamber, the liquid containing a polymerization inhibitor may be supplied to the chamber. 1 g10 min to about 150 g10 min as determined by ASTM D-1238, Procedure B. The transducer structure can be a planar mechanical structure, and all strain gauges can be applied to the same surface of the transducer structure to measure non-radial strain components. Thus, the folding structure allows the tricycle to be retracted for storage and transportation.