# Relationship history for MSHA mine 3602081

Current hierarchy: **Elwood  Swank → Split Vein Coal Company Inc → Aristes 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:** Elwood  Swank → Aristes Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Buck Coal Company → Aristes Strip; 1950-01-01 to 1981-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Buck Coal Company → Aristes Strip; 1950-01-01 to 1981-12-20; source msha-controller-operator-history
- **controller_controls_operator:** Buck Coal Company → Buck Coal Company; 1950-01-01 to 1981-12-20; source msha-controller-operator-history
- **operator_operates_mine:** S D S Coal Company → Aristes Strip; 1981-12-21 to 1983-12-15; source msha-controller-operator-history
- **controller_controls_mine:** Split Vein Coal Co--Delaware Contracting Et Al → Aristes Strip; 1981-12-21 to 1983-12-15; source msha-controller-operator-history
- **controller_controls_operator:** Split Vein Coal Co--Delaware Contracting Et Al → S D S Coal Company; 1981-12-21 to 1983-12-15; source msha-controller-operator-history
- **operator_operates_mine:** S D S Coal Company → Aristes Strip; 1983-12-16 to 1985-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Thomas James B → Aristes Strip; 1983-12-16 to 1985-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Thomas James B → S D S Coal Company; 1983-12-16 to 1985-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Split Vein Coal Company Inc → Aristes Strip; 1985-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elwood  Swank → Split Vein Coal Company Inc; 1985-01-15 to current/open; source msha-controller-operator-history