# Relationship history for MSHA mine 0405188

Current hierarchy: **Larry P  Oliver; Richard D  Oliver → Artesia Ready Mix Concrete Inc → DRY CREEK 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Richard D  Oliver  et al → DRY CREEK PLANT; 1988-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Artesia Ready Mix Concrete Inc → DRY CREEK PLANT; 1992-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard D  Oliver  et al → Artesia Ready Mix Concrete Inc; 1992-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry P  Oliver  et al → Artesia Ready Mix Concrete Inc; 1992-05-01 to current/open; source msha-controller-operator-history