# Relationship history for MSHA mine 4602165

Current hierarchy: **William  Calloway → Liberty Bell Fuel Inc → F 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:** Ranger Fuel Corp → F Mine; 1950-01-01 to 1979-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Pittston Company → F Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Ranger Fuel Corp; 1950-01-01 to 1979-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Pack Bill → F Mine; 1979-01-01 to 1983-07-06; source msha-controller-operator-history
- **operator_operates_mine:** War Eagle Coals Inc → F Mine; 1979-01-29 to 1981-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Pack Bill → War Eagle Coals Inc; 1979-01-29 to 1981-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Liberty Bell Fuel Inc → F Mine; 1981-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Calloway → F Mine; 1981-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Calloway → Liberty Bell Fuel Inc; 1981-02-18 to current/open; source msha-controller-operator-history