# Relationship history for MSHA mine 0900690

Current hierarchy: **Vulcan Materials Company → Vulcan Constr. Materials, L.P. → DAHLONEGA QUARRY**

- 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:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → DAHLONEGA QUARRY; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Colwell Construction Company Inc → DAHLONEGA QUARRY; 1950-01-01 to 1999-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Carlton H  Colwell → DAHLONEGA QUARRY; 1950-01-01 to 1999-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Carlton H  Colwell → Colwell Construction Company Inc; 1950-01-01 to 1999-01-13; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Constr. Materials, L.P. → DAHLONEGA QUARRY; 1999-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Constr. Materials, L.P.; 1999-01-14 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → DAHLONEGA QUARRY; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Constr. Materials, L.P.; 2007-11-16 to current/open; source msha-controller-operator-history