# Relationship history for MSHA mine 4400091

Current hierarchy: **Vulcan Materials Company → Vulcan Constr. Materials, L.P. → Speers Ferry 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) → Speers Ferry Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Penn-Dixie Industries Inc → Speers Ferry Quarry; 1950-01-01 to 1981-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Penn-Dixie Industries Inc → Speers Ferry Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Penn-Dixie Industries Inc → Penn-Dixie Industries Inc; 1950-01-01 to 1981-02-24; source msha-controller-operator-history
- **controller_controls_mine:** John W  Barnette Jr → Speers Ferry Quarry; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dixie Cement Company Inc → Speers Ferry Quarry; 1981-02-25 to 1985-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Moore Mc Cormack Cement Inc  et al → Speers Ferry Quarry; 1981-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moore Mc Cormack Cement Inc  et al → Dixie Cement Company Inc; 1981-02-25 to 1985-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Macgas V Inc  et al → Dixie Cement Company Inc; 1981-02-25 to 1985-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Rim Rock Quarries Inc → Speers Ferry Quarry; 1986-01-01 to 1990-03-25; source msha-controller-operator-history
- **controller_controls_operator:** John W  Barnette Jr → Rim Rock Quarries Inc; 1986-01-01 to 1990-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Constr. Materials, L.P. → Speers Ferry Quarry; 1990-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Constr. Materials, L.P.; 1990-03-26 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Speers Ferry 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