As will be apparent from the foregoing description, cartridge 24 forms a self contained, disposable unit, which may be easily replaced when the stock of {HEAD ~ membrane} 28 on {TAIL ~ roll} 26 is exhausted 
on
As will be apparent from the foregoing description , cartridge 24 forms a self contained , disposable unit , which may be easily replaced when the stock of { HEAD ~ membrane } 28 on { TAIL ~ roll } 26 is exhausted
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 OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH