# Relationship history for MSHA mine 3304199

Current hierarchy: **Boyle Kevin → Hocking Valley Mining Inc → Hocking Valley #2**

- 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:** Boyle Kevin → Hocking Valley #2; 1986-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hocking Valley Mining Inc → Hocking Valley #2; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boyle Kevin → Hocking Valley Mining Inc; 1990-05-01 to current/open; source msha-controller-operator-history