# Relationship history for MSHA mine 1512894

Current hierarchy: **Great Western Resources Inc → Harlan Fuel Company → Harlan Fuel #19**

- 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:** Goldfield Corp → Harlan Fuel #19; 1975-03-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harlan Fuel Company → Harlan Fuel #19; 1981-06-01 to 1982-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Goldfield Corp → Harlan Fuel Company; 1981-06-01 to 1982-02-21; source msha-controller-operator-history
- **operator_operates_mine:** Harlan Fuel Company → Harlan Fuel #19; 1982-02-22 to 1987-02-03; source msha-controller-operator-history
- **controller_controls_mine:** Bow Valley Industries Ltd → Harlan Fuel #19; 1982-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bow Valley Industries Ltd → Harlan Fuel Company; 1982-02-22 to 1987-02-03; source msha-controller-operator-history
- **operator_operates_mine:** Harlan Fuel Company → Harlan Fuel #19; 1987-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Great Western Resources Inc → Harlan Fuel #19; 1987-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Great Western Resources Inc → Harlan Fuel Company; 1987-02-04 to current/open; source msha-controller-operator-history