# Relationship history for MSHA mine 4406632

Current hierarchy: **Ronnie A  Edwards → Red Dog Coal Corp → Mine No 6**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Ronnie A  Edwards → Mine No 6; 1982-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Red Dog Coal Corp → Mine No 6; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronnie A  Edwards → Red Dog Coal Corp; 1991-04-01 to current/open; source msha-controller-operator-history