# Relationship history for MSHA mine 4003145

Current hierarchy: **Vulcan Materials Company → Vulcan Constr. Materials, L.P. → Birds Bridge Sand**

- 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:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Birds Bridge Sand; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Bewley Thomas A → Birds Bridge Sand; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nolichuckey Sand Company Inc → Birds Bridge Sand; 1999-07-01 to 2002-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Bewley Thomas A → Nolichuckey Sand Company Inc; 1999-07-01 to 2002-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Constr. Materials, L.P. → Birds Bridge Sand; 2002-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Constr. Materials, L.P.; 2002-08-08 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Birds Bridge Sand; 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