# Relationship history for MSHA mine 4606540

Current hierarchy: **Patterson W L → We Coal Inc → Fisher Run**

- 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:** Patterson W L → Fisher Run; 1982-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** We Coal Inc → Fisher Run; 1982-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patterson W L → We Coal Inc; 1982-06-01 to current/open; source msha-controller-operator-history