Trust me, Loz, the existence of the anointed as per the Watchtower is unique to them.
Topical Bible isn't a definitive resource, and can't be used as an encyclopaedia.
The whole thing is a result of taking what happened at Pentecost and then creating a doctrine out of it. It is maybe within a particular tradition of which I, with a long lifetime of experience of the Anglican and Catholic churches (of course the Anglican Church is very much within the catholic tradition), have had no encounter. Other experience through friends and extended family of theMethodists, Congregationalists,Presbyterians and others has never brought me into contact with this teaching. So I don't think the understanding is very prevalent.
What I am familiar with, and suspect that this is the origin of the whole thing, is the sacrament of Confirmation, in which the Holy Spirit is conferred on a person through the laying on of hands, by a bishop or, in the case of the Catholic Church, in particular circumstances, of a priest to whom episcopal authority has been granted for that specific occasion. After the Holy Spirit has been received, a person can receive Holy Communion, the Body and Blood of Our Lord in the form of bread and wine. Many Catholics (and Anglicans) do so daily. I have a feeling JW's may not be the only ones who do this only yearly but I can't bring any sect to mind that does. Pretty well every Catholic over the age of, maybe 7 or 8 has been confirmed, and can communicate daily, if they want, and most Anglicans over, maybe 12-14 are also confirmed.
The anointed class of the JW's is their own bizarre creation, pure fiction, as are the doctrinal beliefs appended to it.