# Relationship history for MSHA mine 3608020

Current hierarchy: **NSM PLC → Pbs Coals Inc → Job 47**

- 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:** NSM PLC → Job 47; 1983-05-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pbs Coals Inc → Job 47; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** NSM PLC → Pbs Coals Inc; 1988-05-01 to current/open; source msha-controller-operator-history