# Relationship history for MSHA mine 1510182

Current hierarchy: **Senters Harold & Clarence Senters → Big Hill Coal Company → 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

- **operator_operates_mine:** Randy'S Enterprises → No 1; 1977-01-01 to 1977-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Randal  Lawson → No 1; 1977-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randal  Lawson → Randy'S Enterprises; 1977-01-01 to 1977-07-20; source msha-controller-operator-history
- **operator_operates_mine:** Big Hill Coal Company → No 1; 1977-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Senters Harold & Clarence Senters Et Al → No 1; 1977-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Senters Harold & Clarence Senters Et Al → Big Hill Coal Company; 1977-07-21 to current/open; source msha-controller-operator-history