The computer system 12 wherein said {HEAD ~ cartridge} includes {TAIL ~ a recess} and wherein said holding means includes a lever having an end which hooks into said recess in the cartridge 
includes
The computer system 12 wherein said { HEAD ~ cartridge } includes { TAIL ~ a recess } and wherein said holding means includes a lever having an end which hooks into said recess in the cartridge
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH