# Relationship history for MSHA mine 1518230

Current hierarchy: **John M  Barnett → Barnett Energy, LLC → Job #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** John M  Barnett → Job #1; 1999-12-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J M Barnett & Son Inc → Job #1; 2000-01-01 to 2002-04-17; source msha-controller-operator-history
- **controller_controls_operator:** John M  Barnett → J M Barnett & Son Inc; 2000-01-01 to 2002-04-17; source msha-controller-operator-history
- **operator_operates_mine:** Barnett Energy, LLC → Job #1; 2002-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John M  Barnett → Job #1; 2002-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M  Barnett → Barnett Energy, LLC; 2002-04-18 to current/open; source msha-controller-operator-history