# Relationship history for MSHA mine 4602079

Current hierarchy: **Rag Aktiengesellschaft → Riverton Coal Company → No 35 Mine**

- 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:** Riverton Coal Co → No 35 Mine; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Appalachian Resources Inc → No 35 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Appalachian Resources Inc → Riverton Coal Co; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Riverton Coal Company → No 35 Mine; 1974-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rag Aktiengesellschaft → No 35 Mine; 1974-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rag Aktiengesellschaft → Riverton Coal Company; 1974-11-01 to current/open; source msha-controller-operator-history