# Relationship history for MSHA mine 4500416

Current hierarchy: **Trans Alta Corp → Trans Alta Centralia Mining LLC → Centralia Coal Mine**

- 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:** Centralia Mining Company → Centralia Coal Mine; 1950-01-01 to 2000-05-04; source msha-controller-operator-history
- **controller_controls_mine:** MidAmerican Energy Holdings Company → Centralia Coal Mine; 1950-01-01 to 2000-05-04; source msha-controller-operator-history
- **controller_controls_operator:** MidAmerican Energy Holdings Company → Centralia Mining Company; 1950-01-01 to 2000-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Trans Alta Centralia Mining LLC → Centralia Coal Mine; 2000-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Trans Alta Corp → Centralia Coal Mine; 2000-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trans Alta Corp → Trans Alta Centralia Mining LLC; 2000-05-05 to current/open; source msha-controller-operator-history