# Relationship history for MSHA mine 0301537

Current hierarchy: **Haskell  L  Dickinson II → McGeorge Contracting → Granite Mountain Qrys-Crystal Hill Plt**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Haskell  L  Dickinson II et al → Granite Mountain Qrys-Crystal Hill Plt; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** E C  Rowlett → Granite Mountain Qrys-Crystal Hill Plt; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E C Rowlett Construction Company Inc → Granite Mountain Qrys-Crystal Hill Plt; 1982-11-01 to 2005-05-01; source msha-controller-operator-history
- **controller_controls_operator:** E C  Rowlett → E C Rowlett Construction Company Inc; 1982-11-01 to 2005-05-01; source msha-controller-operator-history
- **operator_operates_mine:** McGeorge Contracting → Granite Mountain Qrys-Crystal Hill Plt; 2005-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Haskell  L  Dickinson II et al → McGeorge Contracting; 2005-05-02 to current/open; source msha-controller-operator-history