# Relationship history for MSHA mine 0102813

Current hierarchy: **Brown Gene → Bar Coal Inc → Higdon 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Bar Coal Inc → Higdon Mine; 1989-07-01 to 1994-02-20; source msha-controller-operator-history
- **controller_controls_mine:** Garrison James B → Higdon Mine; 1989-07-01 to 1994-02-20; source msha-controller-operator-history
- **controller_controls_operator:** Garrison James B → Bar Coal Inc; 1989-07-01 to 1994-02-20; source msha-controller-operator-history
- **controller_controls_mine:** Brown Gene → Higdon Mine; 1993-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bar Coal Inc → Higdon Mine; 1994-02-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown Gene → Bar Coal Inc; 1994-02-21 to current/open; source msha-controller-operator-history