Google came through.
Another pic of it in action - -
"KBT unnumbered - Long Beach CA - 07/27/75
Koppel Bulk Terminal operated in the port of Long Beach for years, and it later became AGREX. (After AGREX ceased operations, this facility was operated by Metropolitan Stevedore, which became Metro Ports.) In 1967, KBT acquired this unnumbered Whitcomb side-rod 45-ton critter, built in September 1945. "