# Relationship history for MSHA mine 4001861

Current hierarchy: **De Voe Robert F → Meta Elkhorn Mining Company Inc → Surface 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:** Stiltner Roger L → Surface No 1; 1975-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meta Elkhorn Mining Inc → Surface No 1; 1975-09-01 to 1985-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Stiltner Roger L → Meta Elkhorn Mining Inc; 1975-09-01 to 1985-11-30; source msha-controller-operator-history
- **controller_controls_mine:** De Voe Robert F Et Al → Surface No 1; 1982-08-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meta Elkhorn Mining Company Inc → Surface No 1; 1985-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** De Voe Robert F Et Al → Meta Elkhorn Mining Company Inc; 1985-12-01 to current/open; source msha-controller-operator-history