# Relationship history for MSHA mine 1516114

Current hierarchy: **Burke Francis D → B R I Mining Inc → Bronco 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:** Harold E  Akers et al → Bronco No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A A & W Coals Inc → Bronco No 1; 1987-07-01 to 1990-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Harold E  Akers et al → A A & W Coals Inc; 1987-07-01 to 1990-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Jim D  Akers et al → A A & W Coals Inc; 1987-07-01 to 1990-10-31; source msha-controller-operator-history
- **operator_operates_mine:** B R I Mining Inc → Bronco No 1; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burke Francis D → Bronco No 1; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burke Francis D → B R I Mining Inc; 1990-11-01 to current/open; source msha-controller-operator-history