# Relationship history for MSHA mine 1800781

Current hierarchy: **KTRV LLC → Heritage Coal & Natural Resources LLC → Koontz Mine**

- 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:** Heritage Coal & Natural Resources LLC → Koontz Mine; 2008-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Angela  Svonavec → Koontz Mine; 2008-09-03 to 2024-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Angela  Svonavec → Heritage Coal & Natural Resources LLC; 2008-09-03 to 2024-02-04; source msha-controller-operator-history
- **controller_controls_mine:** KTRV LLC → Koontz Mine; 2024-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** KTRV LLC → Heritage Coal & Natural Resources LLC; 2024-02-05 to current/open; source msha-controller-operator-history