# Relationship history for MSHA mine 4406623

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

- 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:** United  Company → No 6-A; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronnie A  Edwards → No 6-A; 1982-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → No 6-A; 1991-01-01 to 1991-03-31; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1991-01-01 to 1991-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Red Dog Coal Corp → No 6-A; 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