# Relationship history for MSHA mine 1517068

Current hierarchy: **Great Western Resources Inc → Crockett Collieries (Ky) Inc → Lcb #8a**

- 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:** Darrell  Wagner → Lcb #8a; 1986-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Great Western Resources Inc → Lcb #8a; 1987-02-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Great Western Coal (Ky) Inc → Lcb #8a; 1991-04-01 to 1993-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Great Western Resources Inc → Great Western Coal (Ky) Inc; 1991-04-01 to 1993-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Four Aces Mining Inc → Lcb #8a; 1993-01-22 to 1993-07-26; source msha-controller-operator-history
- **controller_controls_operator:** Darrell  Wagner → Four Aces Mining Inc; 1993-01-22 to 1993-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Crockett Collieries (Ky) Inc → Lcb #8a; 1993-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Great Western Resources Inc → Crockett Collieries (Ky) Inc; 1993-07-27 to current/open; source msha-controller-operator-history