# Relationship history for MSHA mine 0404674

Current hierarchy: **Vulcan Materials Company → Azusa Rock, LLC → Azusa Rock**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Azusa Rock Inc → Azusa Rock; 1983-11-01 to 1999-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Calmat Company  et al → Azusa Rock; 1983-11-01 to 1999-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company  et al → Azusa Rock Inc; 1983-11-01 to 1999-01-05; source msha-controller-operator-history
- **operator_operates_mine:** CalMat Co → Azusa Rock; 1999-01-06 to 2026-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Azusa Rock; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → CalMat Co; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Azusa Rock; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → CalMat Co; 2007-11-16 to 2026-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Azusa Rock, LLC → Azusa Rock; 2026-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Azusa Rock; 2026-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Azusa Rock, LLC; 2026-05-01 to current/open; source msha-controller-operator-history