# Relationship history for MSHA mine 3304138

Current hierarchy: **Blum Raymond A → Blum Coal Company → Mccoy**

- 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

- **controller_controls_mine:** Blum Raymond A → Mccoy; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blum Coal Company → Mccoy; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blum Raymond A → Blum Coal Company; 1988-05-01 to current/open; source msha-controller-operator-history