# Relationship history for MSHA mine 0202489

Current hierarchy: **Camarena Francisco Raphael → Douglas Ready Mix & Materials Inc → Douglas Ready Mix Incorporated**

- 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:** Douglas Ready Mix & Materials Inc → Douglas Ready Mix Incorporated; 1989-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Camarena Francisco Raphael → Douglas Ready Mix Incorporated; 1989-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Camarena Francisco Raphael → Douglas Ready Mix & Materials Inc; 1989-06-01 to current/open; source msha-controller-operator-history