# Relationship history for MSHA mine 1514637

Current hierarchy: **Monroe Dallas W → Dallas W Monroe Construction → 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

- **operator_operates_mine:** Ernest Van Hoose Construction → No 1 Surface; 1984-05-01 to 1985-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Van Hoose Ernest → No 1 Surface; 1984-05-01 to 1985-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Van Hoose Ernest → Ernest Van Hoose Construction; 1984-05-01 to 1985-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Dallas W Monroe Construction → No 1 Surface; 1985-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Monroe Dallas W → No 1 Surface; 1985-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Monroe Dallas W → Dallas W Monroe Construction; 1985-08-02 to current/open; source msha-controller-operator-history