# Relationship history for MSHA mine 1513307

Current hierarchy: **Florida Progress Corporation → Diamond May Coal Company Inc → Mary T Washer**

- 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 → Mary T Washer; 1973-03-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** River Processing Inc → Mary T Washer; 1982-01-01 to 1983-12-20; source msha-controller-operator-history
- **controller_controls_operator:** Pargas Inc → River Processing Inc; 1982-01-01 to 1983-12-20; source msha-controller-operator-history
- **operator_operates_mine:** River Processing Inc → Mary T Washer; 1983-12-21 to 1989-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Coal Ridge Fuels Of Hazard Inc → Mary T Washer; 1983-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coal Ridge Fuels Of Hazard Inc → River Processing Inc; 1983-12-21 to 1989-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Florida Progress Corporation → Mary T Washer; 1989-02-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Diamond May Coal Company Inc → Mary T Washer; 1989-05-02 to 1989-07-17; source msha-controller-operator-history
- **controller_controls_operator:** Florida Progress Corporation → Diamond May Coal Company Inc; 1989-05-02 to 1989-07-17; source msha-controller-operator-history
- **controller_controls_mine:** Charles E  Yates → Mary T Washer; 1989-07-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Adena Fuels Inc → Mary T Washer; 1989-07-18 to 1991-11-12; source msha-controller-operator-history
- **controller_controls_operator:** Charles E  Yates → Adena Fuels Inc; 1989-07-18 to 1991-11-12; source msha-controller-operator-history
- **operator_operates_mine:** Diamond May Coal Company Inc → Mary T Washer; 1991-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Florida Progress Corporation → Diamond May Coal Company Inc; 1991-11-13 to current/open; source msha-controller-operator-history