An erodible device is disclosed for delivering {HEAD ~ an agent} to {TAIL ~ an environment} of use 
An erodible device is disclosed for delivering { HEAD ~ an agent } to { TAIL ~ an environment } of use
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH