# Relationship history for MSHA mine 0404772

Current hierarchy: **Vulcan Materials Company → Triangle Rock Products → TRP-Sacramento 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

- **operator_operates_mine:** Sacramento Aggregates Inc → TRP-Sacramento Plant; 1985-10-01 to 1998-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Neal F  Erickson → TRP-Sacramento Plant; 1985-10-01 to 1998-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Neal F  Erickson → Sacramento Aggregates Inc; 1985-10-01 to 1998-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Calmat Company → TRP-Sacramento Plant; 1987-11-09 to 1999-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Triangle Rock Products Inc → TRP-Sacramento Plant; 1998-03-09 to 1999-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company → Triangle Rock Products Inc; 1998-03-09 to 1999-01-05; source msha-controller-operator-history
- **operator_operates_mine:** CalMat Co. → TRP-Sacramento Plant; 1999-01-06 to 2007-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → TRP-Sacramento 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 Co.; 1999-01-06 to 2007-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Triangle Rock Products → TRP-Sacramento Plant; 2007-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Triangle Rock Products; 2007-02-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company → Triangle Rock Products; 2007-02-01 to 1999-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → TRP-Sacramento 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 Co.; 2007-11-16 to 2007-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Triangle Rock Products; 2007-11-16 to current/open; source msha-controller-operator-history