# Relationship history for MSHA mine 0103346

Current hierarchy: **Vulcan Materials Company → Vulcan Constr. Materials, L.P. → North Birmingham 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → North Birmingham Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → North Birmingham Quarry; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → North Birmingham Quarry; 2001-07-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Aggregates Southeast Inc → North Birmingham Quarry; 2006-07-13 to 2011-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Aggregates Southeast Inc; 2006-07-13 to 2011-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → North Birmingham Quarry; 2007-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Building Materials Inc → North Birmingham Quarry; 2011-04-21 to 2011-10-02; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Building Materials Inc; 2011-04-21 to 2011-10-02; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Constr. Materials, L.P. → North Birmingham Quarry; 2011-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Constr. Materials, L.P.; 2011-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Constr. Materials, L.P.; 2011-10-03 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → North Birmingham Quarry; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge Building Materials Inc; 2015-07-10 to 2011-10-02; source msha-controller-operator-history