# Relationship history for MSHA mine 4003325

Current hierarchy: **Marvin R  Walker Jr; Kathy W  Nicely → Walker's Rock → Walker's Lot**

- 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:** Walker's Rock → Walker's Lot; 2008-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marvin R  Walker Jr et al → Walker's Lot; 2008-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin R  Walker Jr et al → Walker's Rock; 2008-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kathy W  Nicely et al → Walker's Rock; 2008-05-12 to current/open; source msha-controller-operator-history