A fan, with reversible blades, having {HEAD ~ a hub} receiving the stem of the blades and {TAIL ~ an inner retaining ring}, which has outwardly extending projections, supported concentric with the hub 
receiving
A fan , with reversible blades , having { HEAD ~ a hub } receiving the stem of the blades and { TAIL ~ an inner retaining ring } , which has outwardly extending projections , supported concentric with the hub
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH