# Relationship history for MSHA mine 3503580

Current hierarchy: **Merle  Maine → Oregon Concrete LLC → Oregron Concrete PP**

- 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:** Merle  Maine → Oregron Concrete PP; 1986-03-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oregon Concrete LLC → Oregron Concrete PP; 2003-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Merle  Maine → Oregon Concrete LLC; 2003-06-11 to current/open; source msha-controller-operator-history