# Relationship history for MSHA mine 2602198

Current hierarchy: **Gibbons Companies → Gibbons Companies → G & R Big Springs**

- 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:** Gibbons Companies → G & R Big Springs; 1992-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gibbons Companies → G & R Big Springs; 1992-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gibbons Companies → Gibbons Companies; 1992-03-01 to current/open; source msha-controller-operator-history