# Relationship history for MSHA mine 1201861

Current hierarchy: **Bullock Olan & Randall → Bullock & Sons → Eagle Coal Mine**

- 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:** Bullock & Sons → Eagle Coal Mine; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bullock Olan & Randall Et Al → Eagle Coal Mine; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bullock Olan & Randall Et Al → Bullock & Sons; 1981-09-01 to current/open; source msha-controller-operator-history