# Relationship history for MSHA mine 2002945

Current hierarchy: **Mc Kana John F → Mc Kana Mines & Minerals → CHAMPION #1 SHAFT**

- 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:** Mc Kana Mines & Minerals → CHAMPION #1 SHAFT; 1994-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Kana John F → CHAMPION #1 SHAFT; 1994-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Kana John F → Mc Kana Mines & Minerals; 1994-10-01 to current/open; source msha-controller-operator-history