# Relationship history for MSHA mine 2200633

Current hierarchy: **Granite Construction Inc → Dickerson & Bowen Inc → DICKERSON & BOWEN - PLANT #5**

- 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:** Lester  Williams et al → DICKERSON & BOWEN - PLANT #5; 1983-03-01 to 2024-07-31; source msha-controller-operator-history
- **controller_controls_mine:** James H  Williams Sr → DICKERSON & BOWEN - PLANT #5; 1990-04-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southwest Paving Inc → DICKERSON & BOWEN - PLANT #5; 1991-08-01 to 1997-09-30; source msha-controller-operator-history
- **controller_controls_operator:** James H  Williams Sr → Southwest Paving Inc; 1991-08-01 to 1997-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Dickerson & Bowen Inc → DICKERSON & BOWEN - PLANT #5; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lester  Williams et al → Dickerson & Bowen Inc; 1997-10-01 to 2024-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Granite Construction Inc → DICKERSON & BOWEN - PLANT #5; 2024-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Granite Construction Inc → Dickerson & Bowen Inc; 2024-08-01 to current/open; source msha-controller-operator-history