The battery 30 is pushed towards the cover 20, and each protrusion 35 moves the respective wedge 254 away from the beam 154, due to {HEAD ~ the engagement} of a given inclined plane 352 and {TAIL ~ the corresponding wedge} 254 
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The battery 30 is pushed towards the cover 20 , and each protrusion 35 moves the respective wedge 254 away from the beam 154 , due to { HEAD ~ the engagement } of a given inclined plane 352 and { TAIL ~ the corresponding wedge } 254
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 OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH