# Relationship history for MSHA mine 3607581

Current hierarchy: **Potochar Joseph H → Potochar & Potochar Coal Company → Long Strip**

- 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:** Potochar Joseph H → Long Strip; 1970-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Potochar & Potochar Coal Company → Long Strip; 1984-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Potochar Joseph H → Potochar & Potochar Coal Company; 1984-06-01 to current/open; source msha-controller-operator-history