If it was for a B-17 i'm pretty sure it wouldn't have USAF anywhere in it's nomenclature. The USAF wasn't formed until 1947, it was the USAAF before then, and USAAC before sometime in 1941. There were still a few B-17's in the USAF in 1947, but I doubt they would be making new bomb hoist for them then.
But the USAF may have used the same bomb hoist for many aircraft, and several years.