# Relationship history for MSHA mine 3607498

Current hierarchy: **Sorokach Edward & Charles → Sorokach Coal Company → Buck Mountain Slope**

- 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:** Sorokach Coal Company → Buck Mountain Slope; 1983-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sorokach Edward & Charles Et Al → Buck Mountain Slope; 1983-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sorokach Edward & Charles Et Al → Sorokach Coal Company; 1983-09-01 to current/open; source msha-controller-operator-history