# Relationship history for MSHA mine 0504918

Current hierarchy: **Robert H  Scott; Scott  Leonhart → Northfield Partners LLC → Northfield**

- 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:** Northfield Partners LLC → Northfield; 2008-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Leonhart  et al → Northfield; 2008-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Leonhart  et al → Northfield Partners LLC; 2008-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert H  Scott  et al → Northfield Partners LLC; 2008-09-09 to current/open; source msha-controller-operator-history