{HEAD ~ The space} provided between brush members 4 a and 4 b allows {TAIL ~ a mounting strip} to be included in the housing 
{ HEAD ~ The space } provided between brush members 4 a and 4 b allows { TAIL ~ a mounting strip } to be included in the housing
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH