# Relationship history for MSHA mine 1513881

Current hierarchy: **Costain Group PLC → Pyro Mining Company → Pyro #9 Slope William Station**

- 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

- **controller_controls_mine:** Costain Group PLC → Pyro #9 Slope William Station; 1981-04-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pyro Mining Company → Pyro #9 Slope William Station; 1982-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Costain Group PLC → Pyro Mining Company; 1982-12-01 to current/open; source msha-controller-operator-history