# Relationship history for MSHA mine 2003036

Current hierarchy: **Jerald W  Bailey → Bailey Sand & Gravel Company → ELM ST WASH 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:** Bailey Sand & Gravel Company → ELM ST WASH PLANT; 1997-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerald W  Bailey → ELM ST WASH PLANT; 1997-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerald W  Bailey → Bailey Sand & Gravel Company; 1997-09-01 to current/open; source msha-controller-operator-history