# Relationship history for MSHA mine 3608776

Current hierarchy: **Kovalchick Cathy → Kovalchick Coal Company → Super 7 Strip**

- 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:** Kovalchick Coal Company → Super 7 Strip; 1999-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kovalchick Cathy → Super 7 Strip; 1999-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kovalchick Cathy → Kovalchick Coal Company; 1999-03-01 to current/open; source msha-controller-operator-history