# Relationship history for MSHA mine 3607350

Current hierarchy: **Eugene T  Sosko → Sosko Coal Co. Inc. → Labosky 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

- **operator_operates_mine:** Sosko Coal Co. Inc. → Labosky Strip; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eugene T  Sosko → Labosky Strip; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eugene T  Sosko → Sosko Coal Co. Inc.; 1982-08-01 to current/open; source msha-controller-operator-history