said inclined surface is disposed only at {HEAD ~ said lowermost portion} of {TAIL ~ said wall} and extends lower than said lever, 
of
said inclined surface is disposed only at { HEAD ~ said lowermost portion } of { TAIL ~ said wall } and extends lower than said lever ,
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH