# Relationship history for MSHA mine 0404162

Current hierarchy: **Vulcan Materials Company → Calmat Company → ORO GRANDE ROCK 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:** Industrial Asphalt → ORO GRANDE ROCK PLANT; 1950-01-01 to 1983-12-22; source msha-controller-operator-history
- **controller_controls_mine:** Gulf Oil Corp → ORO GRANDE ROCK PLANT; 1950-01-01 to 1983-12-22; source msha-controller-operator-history
- **controller_controls_operator:** Gulf Oil Corp → Industrial Asphalt; 1950-01-01 to 1983-12-22; source msha-controller-operator-history
- **operator_operates_mine:** Industrial Asphalt → ORO GRANDE ROCK PLANT; 1983-12-23 to 1999-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Calmat Company → ORO GRANDE ROCK PLANT; 1983-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company → Industrial Asphalt; 1983-12-23 to 1999-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Calmat Company → ORO GRANDE ROCK PLANT; 1999-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → ORO GRANDE ROCK PLANT; 1999-01-06 to 2007-11-15; 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 → ORO GRANDE ROCK PLANT; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Calmat Company; 2007-11-16 to current/open; source msha-controller-operator-history