# Relationship history for MSHA mine 0405277

Current hierarchy: **Vulcan Materials Company → Calmat Company → TRP-Irvine Lake Plant**

- 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:** Calmat Company → TRP-Irvine Lake Plant; 1987-11-09 to 1999-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Triangle Rock Products Inc → TRP-Irvine Lake Plant; 1996-01-01 to 1999-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company → Triangle Rock Products Inc; 1996-01-01 to 1999-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Calmat Company → TRP-Irvine Lake Plant; 1999-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → TRP-Irvine Lake Plant; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Triangle Rock Products Inc; 1999-01-06 to 1999-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Calmat Company; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → TRP-Irvine Lake Plant; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Triangle Rock Products Inc; 2007-11-16 to 1999-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Calmat Company; 2007-11-16 to current/open; source msha-controller-operator-history