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 {TAIL ~ the magnets} 14 and 24 and the engagement between the projection 26 and {HEAD ~ the groove} 16 
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 { TAIL ~ the magnets } 14 and 24 and the engagement between the projection 26 and { HEAD ~ 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 TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH