# Relationship history for MSHA mine 1512863

Current hierarchy: **Mc Neil Dearl → Knox Energy Corp → Knox Energy Mine No 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:** Mc Neil Dearl → Knox Energy Mine No 2; 1981-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Knox Energy Corp → Knox Energy Mine No 2; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Neil Dearl → Knox Energy Corp; 1981-05-01 to current/open; source msha-controller-operator-history