# Relationship history for MSHA mine 0301671

Current hierarchy: **Black Marlin F → Mystic Mountain Crystals → Mystic Two**

- 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

- **controller_controls_mine:** Black Marlin F → Mystic Two; 1989-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mystic Mountain Crystals → Mystic Two; 1989-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Black Marlin F → Mystic Mountain Crystals; 1989-11-01 to current/open; source msha-controller-operator-history