{HEAD ~ said introducing and mixture forming means} comprising a wax medium containing {TAIL ~ octenol}, said medium having a porous exterior for allowing gaseous octenol to escape and mix with discharged carbon dioxide in the housing 
{ HEAD ~ said introducing and mixture forming means } comprising a wax medium containing { TAIL ~ octenol } , said medium having a porous exterior for allowing gaseous octenol to escape and mix with discharged carbon dioxide in the housing
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH 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