# Relationship history for MSHA mine 1102877

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Rochester 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) → Rochester Sand & Gravel; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Builders Sand Of Illinois Inc → Rochester Sand & Gravel; 1988-10-01 to 1993-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Peter E  Powell → Rochester Sand & Gravel; 1988-10-01 to 1993-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Peter E  Powell → Builders Sand Of Illinois Inc; 1988-10-01 to 1993-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Builders Sand & Gravel Inc → Rochester Sand & Gravel; 1993-01-15 to 2002-09-15; source msha-controller-operator-history
- **controller_controls_mine:** Ray  Wright → Rochester Sand & Gravel; 1993-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray  Wright → Builders Sand & Gravel Inc; 1993-01-15 to 2002-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Rochester Sand & Gravel; 2002-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 2002-09-16 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Rochester Sand & Gravel; 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