# Relationship history for MSHA mine 4200098

Current hierarchy: **Aarra Robert T → American Fuel Corp → King 4**

- 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:** United States Fuel Company → King 4; 1950-01-01 to 1980-04-23; source msha-controller-operator-history
- **controller_controls_mine:** U V Industries Inc → King 4; 1950-01-01 to 1980-04-23; source msha-controller-operator-history
- **controller_controls_operator:** U V Industries Inc → United States Fuel Company; 1950-01-01 to 1980-04-23; source msha-controller-operator-history
- **controller_controls_mine:** N V F Company → King 4; 1980-04-01 to 1991-01-01; source msha-controller-operator-history
- **operator_operates_mine:** United States Fuel Company → King 4; 1980-04-24 to 1991-01-01; source msha-controller-operator-history
- **controller_controls_operator:** N V F Company → United States Fuel Company; 1980-04-24 to 1991-01-01; source msha-controller-operator-history
- **operator_operates_mine:** United States Fuel Company → King 4; 1991-01-02 to 1995-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Mueller Industries Inc → King 4; 1991-01-02 to 1997-09-08; source msha-controller-operator-history
- **controller_controls_operator:** Mueller Industries Inc → United States Fuel Company; 1991-01-02 to 1995-04-30; source msha-controller-operator-history
- **operator_operates_mine:** American Fuel Corp → King 4; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aarra Robert T → King 4; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aarra Robert T → American Fuel Corp; 1995-05-01 to current/open; source msha-controller-operator-history