A printed circuit board, a memory module having the same, and a fabrication method thereof. The clutch comprises a spring and a clutch cavity, and the spring and the clutch cavity are positioned inside of the clutch. The polymeric matrix may be a polymer used in the product, or it may be a polymer with degradation properties similar to that of a polymer used in the product. In at least some embodiments, the beacon can cause another type of communication channel to be activated to establish communications with a device from which the beacon was received. The globe and the case integrally form a housing. The strainer wall element is built up from a plurality of modular cassette units, which respectively contain a plurality of screen elements open towards the inlet side and connected to the outflow side.