# Relationship history for MSHA mine 1502251

Current hierarchy: **Bennett Clyde V → Grays Knob Coal Company → Mill Creek No I Mine**

- 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:** Grays Knob Coal Company → Mill Creek No I Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bennett Clyde V → Mill Creek No I Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bennett Clyde V → Grays Knob Coal Company; 1950-01-01 to current/open; source msha-controller-operator-history