# Relationship history for MSHA mine 1515396

Current hierarchy: **Rex  Fought → Crown Royal Mining Inc → No 1 Surface**

- 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

- **operator_operates_mine:** Elkhorn Construction Company Inc → No 1 Surface; 1985-10-01 to 1988-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Epling Walter Ben & Michael R → No 1 Surface; 1985-10-01 to 1992-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Epling Walter Ben & Michael R → Elkhorn Construction Company Inc; 1985-10-01 to 1988-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Liberty Coal Company Inc → No 1 Surface; 1988-04-05 to 1989-05-24; source msha-controller-operator-history
- **controller_controls_mine:** J D McDonald et al → No 1 Surface; 1988-04-05 to 1989-05-24; source msha-controller-operator-history
- **controller_controls_operator:** J D McDonald et al → Liberty Coal Company Inc; 1988-04-05 to 1989-05-24; source msha-controller-operator-history
- **operator_operates_mine:** Crown Royal Mining Inc → No 1 Surface; 1989-05-25 to 1990-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Cruey Edgar → No 1 Surface; 1989-05-25 to 1990-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Cruey Edgar → Crown Royal Mining Inc; 1989-05-25 to 1990-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Crown Royal Mining Inc → No 1 Surface; 1990-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rex  Fought → No 1 Surface; 1990-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rex  Fought → Crown Royal Mining Inc; 1990-08-08 to current/open; source msha-controller-operator-history