The housing is provided with a slot like {TAIL ~ longitudinal opening} , which on either side is flanked by {HEAD ~ a housing limb}  
The housing is provided with a slot like { TAIL ~ longitudinal opening } , which on either side is flanked by { HEAD ~ a housing limb }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH