The aircraft was ordered as the double-mission XTBH-1 (torpedo-bomber) but was eventually delivered as the only ever TRIPLE-mission aircraft in the whole U.S. Navy inventory, the forgettable and forgotten XPTBH-2...
The engineer behind the Hall Aluminum Aircraft Company of Buffalo, NY, was Cornell grad Charles Ward Hall. He was the also the son of Charles Martin Hall - the latter invented the electrolytic method of aluminum production (and founded Alcoa) so C. W. Hall came by his interest in aluminum honestly.
There was also a Charles S. Hall of Oakland, California, who patented designs for the Hall Engineering & Aircraft Construction Company of Reno, Nevada. I'm not sure that the 'S' was for Spurgeon ... but perhaps this was your relative?
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