# Relationship history for MSHA mine 0202690

Current hierarchy: **CCI  (Clyde Companies Inc) → Sunroc Corporation → Beaver Dam Arizona**

- 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:** CCI  (Clyde Companies Inc) → Beaver Dam Arizona; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tri State Materials → Beaver Dam Arizona; 1997-05-01 to 2006-01-02; source msha-controller-operator-history
- **controller_controls_mine:** John B  Ewles → Beaver Dam Arizona; 1997-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John B  Ewles → Tri State Materials; 1997-05-01 to 2006-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Sunroc Corporation → Beaver Dam Arizona; 2006-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CCI  (Clyde Companies Inc) → Sunroc Corporation; 2006-01-03 to current/open; source msha-controller-operator-history