# Relationship history for MSHA mine 2402600

Current hierarchy: **Bill N.W.  Nolen → N L C Inc → Portable Finly Screen**

- 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:** N L C Inc → Portable Finly Screen; 2011-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bill N.W.  Nolen et al → Portable Finly Screen; 2011-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill N.W.  Nolen et al → N L C Inc; 2011-08-30 to current/open; source msha-controller-operator-history