# Relationship history for MSHA mine 4404283

Current hierarchy: **Charles H  Gent → Big Fork Coal Company Inc → Gardner Dock #1**

- 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:** Charles H  Gent → Gardner Dock #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Fork Coal Company Inc → Gardner Dock #1; 1976-02-01 to 1980-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Charles H  Gent → Big Fork Coal Company Inc; 1976-02-01 to 1980-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Stanley  Ingram → Gardner Dock #1; 1980-01-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hargreaves Mitchell Inc → Gardner Dock #1; 1980-03-05 to 1987-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Stanley  Ingram → Hargreaves Mitchell Inc; 1980-03-05 to 1987-04-08; source msha-controller-operator-history
- **operator_operates_mine:** Big Fork Coal Company Inc → Gardner Dock #1; 1987-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles H  Gent → Big Fork Coal Company Inc; 1987-04-09 to current/open; source msha-controller-operator-history