# Relationship history for MSHA mine 0102765

Current hierarchy: **Costain Group PLC → Energy Supply Inc → Liberty 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

- **controller_controls_mine:** Costain Group PLC → Liberty Mine; 1985-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Supply Inc → Liberty Mine; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Costain Group PLC → Energy Supply Inc; 1988-05-01 to current/open; source msha-controller-operator-history