# Relationship history for MSHA mine 4003178

Current hierarchy: **Vulcan Materials Company → Vulcan Constr. Materials, L.P. → Polk County 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) → Polk County Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Starr Mountain Stone → Polk County Quarry; 2001-08-01 to 2005-03-31; source msha-controller-operator-history
- **controller_controls_mine:** J S  Haren → Polk County Quarry; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J S  Haren → Starr Mountain Stone; 2001-08-01 to 2005-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Polk County Stone, LLC → Polk County Quarry; 2005-04-01 to 2005-08-18; source msha-controller-operator-history
- **controller_controls_mine:** J S  Haren → Polk County Quarry; 2005-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J S  Haren → Polk County Stone, LLC; 2005-04-01 to 2005-08-18; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Constr. Materials, L.P. → Polk County Quarry; 2005-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Constr. Materials, L.P.; 2005-08-19 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Polk County 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