# Relationship history for MSHA mine 1516741

Current hierarchy: **El Paso Energy Corp → Anr Coal Company Llc → Knee High Mine #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Elmer  Jent → Knee High Mine #1; 1984-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald S  Ratliff → Knee High Mine #1; 1988-07-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jent & Franks Coal Company Inc → Knee High Mine #1; 1989-10-01 to 1992-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Elmer  Jent → Jent & Franks Coal Company Inc; 1989-10-01 to 1992-06-14; source msha-controller-operator-history
- **operator_operates_mine:** R S Mining Inc → Knee High Mine #1; 1992-06-15 to 1993-04-07; source msha-controller-operator-history
- **controller_controls_operator:** Ronald S  Ratliff → R S Mining Inc; 1992-06-15 to 1993-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Cozak Coal Inc → Knee High Mine #1; 1993-04-08 to 1993-12-01; source msha-controller-operator-history
- **controller_controls_mine:** (William) Scott  Moore → Knee High Mine #1; 1993-04-08 to 1993-12-01; source msha-controller-operator-history
- **controller_controls_operator:** (William) Scott  Moore → Cozak Coal Inc; 1993-04-08 to 1993-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Anr Coal Company Llc → Knee High Mine #1; 1993-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → Knee High Mine #1; 1993-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Anr Coal Company Llc; 1993-12-02 to current/open; source msha-controller-operator-history