# Relationship history for MSHA mine 1514481

Current hierarchy: **Wendell  Elza → Ruby Coal Company → Travis Creek**

- 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:** Wendell  Elza → Travis Creek; 1981-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ruby Coal Company → Travis Creek; 1984-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wendell  Elza → Ruby Coal Company; 1984-03-01 to current/open; source msha-controller-operator-history