# Relationship history for MSHA mine 3610150

Current hierarchy: **KTRV LLC → Heritage Coal & Natural Resources,LLC → MAST 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Angela  Svonavec → MAST MINE; 2008-09-03 to 2024-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Heritage Coal & Natural Resources,LLC → MAST MINE; 2015-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Angela  Svonavec → Heritage Coal & Natural Resources,LLC; 2015-07-09 to 2024-02-04; source msha-controller-operator-history
- **controller_controls_mine:** KTRV LLC → MAST 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