When the metallic parts 11 and 12 are thus coupled together, this coupled state is maintained by the combined action of the magnetic attraction between the magnets 14 and 24 and {HEAD ~ the engagement} between {TAIL ~ the projection} 26 and the groove 16 
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When the metallic parts 11 and 12 are thus coupled together , this coupled state is maintained by the combined action of the magnetic attraction between the magnets 14 and 24 and { HEAD ~ the engagement } between { TAIL ~ the projection } 26 and the groove 16
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH