# Relationship history for MSHA mine 4202052

Current hierarchy: **Wolverine Fuels LLC → HUNTER PREP PLANT, LLC → HUNTER PREP PLANT**

- 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

- **controller_controls_mine:** MidAmerican Energy Holdings Company → HUNTER PREP PLANT; 1986-04-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy West Mining Company → HUNTER PREP PLANT; 1989-10-01 to 2015-06-04; source msha-controller-operator-history
- **controller_controls_operator:** MidAmerican Energy Holdings Company → Energy West Mining Company; 1989-10-01 to 2015-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Hunter Prep Plant, LLC → HUNTER PREP PLANT; 2015-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wolverine Fuels LLC → HUNTER PREP PLANT; 2015-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wolverine Fuels LLC → Hunter Prep Plant, LLC; 2015-06-05 to current/open; source msha-controller-operator-history