# Relationship history for MSHA mine 3608605

Current hierarchy: **Niles V  Powell → Acv Power Corp → Lower Burrell**

- 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:** Niles V  Powell → Lower Burrell; 1993-11-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Acv Power Corp → Lower Burrell; 1997-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Niles V  Powell → Acv Power Corp; 1997-02-01 to current/open; source msha-controller-operator-history