# Relationship history for MSHA mine 4607759

Current hierarchy: **Gioia Gary A & Bernard → G & B Coal Inc → Liston 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:** G & B Coal Inc → Liston Mine; 1989-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gioia Gary A & Bernard → Liston Mine; 1989-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gioia Gary A & Bernard → G & B Coal Inc; 1989-09-01 to current/open; source msha-controller-operator-history