# Relationship history for MSHA mine 1507910

Current hierarchy: **Cornett James E → B & C Coal Co → No 2 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:** B & C Coal Co → No 2 Mine; 1974-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cornett James E → No 2 Mine; 1974-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cornett James E → B & C Coal Co; 1974-12-12 to current/open; source msha-controller-operator-history