It was a portable crane used to remove a complete crashed airplane from a runway. To quickly clear the runway so other airplanes could land. This was back during WW2, when a lot of planes had failing hydraulics from battle damage and their landing gear would fail to deploy.
MM built some, (9 maybe) powered by the GTX 6x6 military tractor. Also, Letourneau built some using their Tournapull power unit for power.
I don't know if any of them survived. Probably scrapped. I think at least one of the GTX tractors survived.