# Relationship history for MSHA mine 2401635

Current hierarchy: **Byrd John → John Byrd → Nick And Dick 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:** John Byrd → Nick And Dick Mine; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Byrd John → Nick And Dick Mine; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Byrd John → John Byrd; 1981-06-01 to current/open; source msha-controller-operator-history