# Relationship history for MSHA mine 1505213

Current hierarchy: **Woodward Earnest → B H B Coal Company → Meat Skin Prep 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

- **operator_operates_mine:** B H B Coal Company → Meat Skin Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Woodward Earnest → Meat Skin Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Woodward Earnest → B H B Coal Company; 1950-01-01 to current/open; source msha-controller-operator-history