# Relationship history for MSHA mine 4300657

Current hierarchy: **James F  Sheldon Jr → Jim Sheldon Excavating Inc. → Power Screen 2100**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Jim Sheldon Excavating Inc. → Power Screen 2100; 2006-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James F  Sheldon Jr → Power Screen 2100; 2006-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James F  Sheldon Jr → Jim Sheldon Excavating Inc.; 2006-11-14 to current/open; source msha-controller-operator-history