# Relationship history for MSHA mine 4000077

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Richard City 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) → Richard City Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Penn-Dixie Industries Inc → Richard City Quarry; 1950-01-01 to 1981-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Penn-Dixie Industries Inc → Richard City 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 1981-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Moore Mc Cormack Cement Inc  et al → Richard City Quarry; 1981-02-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dixie Cement Company Inc → Richard City Quarry; 1981-06-16 to 1985-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Moore Mc Cormack Cement Inc  et al → Dixie Cement Company Inc; 1981-06-16 to 1985-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Macgas V Inc  et al → Dixie Cement Company Inc; 1981-06-16 to 1985-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Richard City Quarry; 1985-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 1985-03-12 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Richard City Quarry; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2007-11-16 to current/open; source msha-controller-operator-history