# Relationship history for MSHA mine 1515080

Current hierarchy: **Newsome Donald → D M & M Coal Company Inc → Mine #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

- **operator_operates_mine:** Walnut Branch Coal Company → Mine #1; 1985-02-01 to 1988-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Cornett Earl M & Warren J Mullins → Mine #1; 1985-02-01 to 1988-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Cornett Earl M & Warren J Mullins → Walnut Branch Coal Company; 1985-02-01 to 1988-05-09; source msha-controller-operator-history
- **operator_operates_mine:** D M & M Coal Company Inc → Mine #1; 1988-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Newsome Donald → Mine #1; 1988-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newsome Donald → D M & M Coal Company Inc; 1988-05-10 to current/open; source msha-controller-operator-history