# Relationship history for MSHA mine 3200875

Current hierarchy: **Concord Energy Holdings LLC → Concord Field Services LLC → Portable #1**

- 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:** Seifert Enterprises LLC → Portable #1; 2010-12-01 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Kent  Beach et al → Portable #1; 2010-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kent  Beach et al → Seifert Enterprises LLC; 2010-12-01 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Trenton  Stafford et al → Seifert Enterprises LLC; 2010-12-01 to 2011-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Concord Field Services LLC → Portable #1; 2011-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Concord Energy Holdings LLC → Portable #1; 2011-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Concord Energy Holdings LLC → Concord Field Services LLC; 2011-06-15 to current/open; source msha-controller-operator-history