{HEAD ~ a timing gear} carried by said housing and within {TAIL ~ said chamber} and having a predetermined number of teeth 
carried within
{ HEAD ~ a timing gear } carried by said housing and within { TAIL ~ said chamber } and having a predetermined number of teeth
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH