MB-4 aircraft Tractor: PSI

I photographed this PSI MB-4 aircraft tug at Oshkosh during a trip for the 2024 EAA AirVenture.

Though they are named the same, this is quite different than the Coleman/Entwhistle MB-4 or the NMC-Wollard MB-4 aircraft tugs.

PSI MB-4 aircraft tug

Oshkosh 2024