# Relationship history for MSHA mine 3607622

Current hierarchy: **Harner Roy E & Delbert L Artz → Keno No 2 Slope → No 2 Slope**

- 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:** Keno No 2 Slope → No 2 Slope; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harner Roy E & Delbert L Artz → No 2 Slope; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harner Roy E & Delbert L Artz → Keno No 2 Slope; 1984-10-01 to current/open; source msha-controller-operator-history