# Relationship history for MSHA mine 4605532

Current hierarchy: **Mc Cann John H & John W Benson → Appalachian Pocahontas Coal Company Inc → Preparation Plant #1**

- 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:** Appalachian Pocahontas Coal Company Inc → Preparation Plant #1; 1977-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Cann John H & John W Benson → Preparation Plant #1; 1977-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Cann John H & John W Benson → Appalachian Pocahontas Coal Company Inc; 1977-05-01 to current/open; source msha-controller-operator-history