# Relationship history for MSHA mine 1102880

Current hierarchy: **Vulcan Materials Company → Vulcan Materials Company → DECATUR SAND & GRAVEL**

- 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) → DECATUR SAND & GRAVEL; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Materials Company → DECATUR SAND & GRAVEL; 1989-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Materials Company; 1989-03-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → DECATUR SAND & GRAVEL; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Materials Company; 2007-11-16 to current/open; source msha-controller-operator-history