# Relationship history for MSHA mine 3003639

Current hierarchy: **David  Pfeiffer → Man O'Trees Inc → Metso (Nordberg) NO # SN 20360448**

- 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

- **operator_operates_mine:** Man O'Trees Inc → Metso (Nordberg) NO # SN 20360448; 2008-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Pfeiffer → Metso (Nordberg) NO # SN 20360448; 2008-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Pfeiffer → Man O'Trees Inc; 2008-06-19 to current/open; source msha-controller-operator-history