# Relationship history for MSHA mine 4609672

Current hierarchy: **Lucy M  Taylor → Black Water, Inc → Prep Plant 1720**

- 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

- **controller_controls_mine:** Lucy M  Taylor → Prep Plant 1720; 2017-03-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Water, Inc → Prep Plant 1720; 2025-08-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lucy M  Taylor → Black Water, Inc; 2025-08-07 to current/open; source msha-controller-operator-history