Inspection of Fish Egg Battery Published on April 12, 2016 in The Key to Lean – Plan, Do, Check, Act!Full resolution (2922 × 2348) Inspection of Fish Egg Battery Close inspection of fish egg battery 1936. Department of the Interior. Fish and Wildlife Service. Minneapolis Regional Office. (1940 - 1970). Source File:Close inspection of egg battery - NARA - 283866.jpg, in public domain.