{HEAD ~ Sheet steel pan forms} bent or rollformed to specific universal profiles allow {TAIL ~ the manufacture} of concrete tread filled steel stairs or precast concrete stairs 
allow
{ HEAD ~ Sheet steel pan forms } bent or rollformed to specific universal profiles allow { TAIL ~ the manufacture } of concrete tread filled steel stairs or precast concrete stairs
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH