# Relationship history for MSHA mine 1511516

Current hierarchy: **Hughes Group Inc → Huscoal Inc → Huscoal #11**

- 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:** Pargas Inc → Huscoal #11; 1973-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Ralph → Huscoal #11; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hughes Group Inc → Huscoal #11; 1977-06-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R J F Coal Company → Huscoal #11; 1978-08-01 to 1982-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Ralph → R J F Coal Company; 1978-08-01 to 1982-12-06; source msha-controller-operator-history
- **operator_operates_mine:** R J F Coal Inc → Huscoal #11; 1982-12-07 to 1983-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Bowling James → Huscoal #11; 1982-12-07 to 1983-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Bowling James → R J F Coal Inc; 1982-12-07 to 1983-01-24; source msha-controller-operator-history
- **operator_operates_mine:** River Processing Inc → Huscoal #11; 1983-01-25 to 1983-12-20; source msha-controller-operator-history
- **controller_controls_operator:** Pargas Inc → River Processing Inc; 1983-01-25 to 1983-12-20; source msha-controller-operator-history
- **operator_operates_mine:** R J F Coal Company Inc → Huscoal #11; 1983-12-21 to 1989-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Coal Ridge Fuels Of Hazard Inc → Huscoal #11; 1983-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coal Ridge Fuels Of Hazard Inc → R J F Coal Company Inc; 1983-12-21 to 1989-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Diamond May Coal Company Inc → Huscoal #11; 1989-02-10 to 1989-10-29; source msha-controller-operator-history
- **controller_controls_mine:** Florida Progress Corporation → Huscoal #11; 1989-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Florida Progress Corporation → Diamond May Coal Company Inc; 1989-02-10 to 1989-10-29; source msha-controller-operator-history
- **operator_operates_mine:** Neace Construction Inc → Huscoal #11; 1989-10-30 to 1990-06-17; source msha-controller-operator-history
- **controller_controls_mine:** Neace Sherman → Huscoal #11; 1989-10-30 to 1990-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Neace Sherman → Neace Construction Inc; 1989-10-30 to 1990-06-17; source msha-controller-operator-history
- **operator_operates_mine:** A & S Coal Inc → Huscoal #11; 1990-06-18 to 1992-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Vires Leo → Huscoal #11; 1990-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vires Leo → A & S Coal Inc; 1990-06-18 to 1992-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Huscoal Inc → Huscoal #11; 1992-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hughes Group Inc → Huscoal Inc; 1992-01-02 to current/open; source msha-controller-operator-history