# Relationship history for MSHA mine 1514977

Current hierarchy: **Stanley W Osborne → Joshco Mining Inc → No 2**

- 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:** Surefire Coals Inc → No 2; 1984-11-01 to 1992-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Denzil R  Hall → No 2; 1984-11-01 to 1992-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Denzil R  Hall → Surefire Coals Inc; 1984-11-01 to 1992-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Stanley W Osborne → No 2; 1990-06-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Joshco Mining Inc → No 2; 1992-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley W Osborne → Joshco Mining Inc; 1992-09-22 to current/open; source msha-controller-operator-history