wherein the first fixing position, the second fixing position, and {HEAD ~ the third fixing position} are {TAIL ~ positions} at which the one of battery charging plug connectors fixed to the battery charging cover or the expansion battery charging cover is insertable into the one of battery charging slots of portable information terminals 
are
wherein the first fixing position , the second fixing position , and { HEAD ~ the third fixing position } are { TAIL ~ positions } at which the one of battery charging plug connectors fixed to the battery charging cover or the expansion battery charging cover is insertable into the one of battery charging slots of portable information terminals
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH