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wrote:

785 For grabbing logs or poles, probably under water. You set the
cross-piece to hold the tongs open, and when you lower it over the
item, the cross-piece is knocked out of the way, allowing the tongs to
close when the unit is hauled up by the ring.

Not necessarily under water. We had those things (phone company, early
'80s) just as "finger savers". Seems it was a significant source of
accidents, people having to manually open the grab jaws over a pole
beforehand.