# Relationship history for MSHA mine 3606145

Current hierarchy: **Hudock Richard & John Moses → H & M Coal Company → Dvorchak 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:** Dvorchak Coal Company → Dvorchak Strip; 1976-06-08 to 1979-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Dvorchak Edward → Dvorchak Strip; 1976-06-08 to 1979-08-26; source msha-controller-operator-history
- **controller_controls_operator:** Dvorchak Edward → Dvorchak Coal Company; 1976-06-08 to 1979-08-26; source msha-controller-operator-history
- **operator_operates_mine:** H & M Coal Company → Dvorchak Strip; 1979-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hudock Richard & John Moses → Dvorchak Strip; 1979-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hudock Richard & John Moses → H & M Coal Company; 1979-08-27 to current/open; source msha-controller-operator-history