# Relationship history for MSHA mine 4002720

Current hierarchy: **Gilliland William C & Charles H Gibson → G & G Excavating → No 1 Strip**

- 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:** G & G Excavating → No 1 Strip; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gilliland William C & Charles H Gibson → No 1 Strip; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gilliland William C & Charles H Gibson → G & G Excavating; 1981-06-01 to current/open; source msha-controller-operator-history