# Relationship history for MSHA mine 1510531

Current hierarchy: **Wesley D.  Burke → No 8 Limited Of Virginia → No 1 Surface**

- 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:** Davidson J E → No 1 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** No 8 Limited Of Virginia → No 1 Surface; 1977-06-01 to 1984-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Davidson J E → No 8 Limited Of Virginia; 1977-06-01 to 1984-08-09; source msha-controller-operator-history
- **operator_operates_mine:** No 8 Limited Of Virginia → No 1 Surface; 1984-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wesley D.  Burke et al → No 1 Surface; 1984-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wesley D.  Burke et al → No 8 Limited Of Virginia; 1984-08-10 to current/open; source msha-controller-operator-history