# Relationship history for MSHA mine 1513905

Current hierarchy: **Ronald S  Ratliff → R S Mining Inc → No 36**

- 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:** Freeman Bruce Et Al → No 36; 1972-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → No 36; 1979-06-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Calahan Elkhorn Coal Company Inc → No 36; 1983-01-01 to 1984-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Freeman Bruce Et Al → Calahan Elkhorn Coal Company Inc; 1983-01-01 to 1984-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Enterprise Coal Company → No 36; 1984-03-30 to 1984-10-16; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Enterprise Coal Company; 1984-03-30 to 1984-10-16; source msha-controller-operator-history
- **operator_operates_mine:** Little Fork Coal Company Inc → No 36; 1984-10-17 to 1988-07-07; source msha-controller-operator-history
- **controller_controls_mine:** Tester Rufus → No 36; 1984-10-17 to 1988-07-07; source msha-controller-operator-history
- **controller_controls_operator:** Tester Rufus → Little Fork Coal Company Inc; 1984-10-17 to 1988-07-07; source msha-controller-operator-history
- **operator_operates_mine:** R S Mining Inc → No 36; 1988-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald S  Ratliff → No 36; 1988-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald S  Ratliff → R S Mining Inc; 1988-07-08 to current/open; source msha-controller-operator-history