# Relationship history for MSHA mine 4405525

Current hierarchy: **Richardson Dowell → R & R Coal Company Inc → No 1**

- 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:** Ratliff Ira-Bill Et Al → No 1; 1976-05-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Triple R Coal Company → No 1; 1980-10-01 to 1981-07-28; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Ira-Bill Et Al → Triple R Coal Company; 1980-10-01 to 1981-07-28; source msha-controller-operator-history
- **operator_operates_mine:** R & R Coal Company Inc → No 1; 1981-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richardson Dowell → No 1; 1981-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richardson Dowell → R & R Coal Company Inc; 1981-07-29 to current/open; source msha-controller-operator-history