A filter cartridge for use in severe or harsh applications, such as acidic or alkaline environments or hot or cold temperatures. Another aspect of the invention is a method of manufacturing a stent by forming hydroxyapatite fibers and biodegradable polymeric fibers, and interweaving the fibers to form a stent wall. A controller controls the signal processor in response to setting information of the connection and installation of a plurality of speakers to which the outputs of the plurality of audio power amplifiers are respectively supplied. 0 \u03bcm, an average width greater than about 0. This building construction drawing system is easier and faster for the designer to learn and to use effectively because the designer does not need to know or learn how to find the command he or she wants using a traditional mouse or keyboard input device, which can be cumbersome and slow.