# Relationship history for MSHA mine 4603148

Current hierarchy: **Belco Petroleum Corp → Kitchekan Fuel Corp → No 60 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:** Matoaka Mining Co → No 60 Mine; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Hawley Coal Mng Co & Wheeling Pittsburgh Steel Cor → No 60 Mine; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Hawley Coal Mng Co & Wheeling Pittsburgh Steel Cor → Matoaka Mining Co; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Matoaka Mining Co → No 60 Mine; 1974-11-01 to 1975-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Kitchekan Fuel Corp & W-P Coal Co → No 60 Mine; 1974-11-01 to 1975-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Kitchekan Fuel Corp & W-P Coal Co → Matoaka Mining Co; 1974-11-01 to 1975-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Kitchekan Fuel Corp → No 60 Mine; 1976-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Belco Petroleum Corp → No 60 Mine; 1976-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Belco Petroleum Corp → Kitchekan Fuel Corp; 1976-01-01 to current/open; source msha-controller-operator-history