# Relationship history for MSHA mine 1516912

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

- 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 #8; 1986-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Great Western Resources Inc → Lcb #8; 1987-02-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Great Western Coal (Ky) Inc → Lcb #8; 1990-06-01 to 1992-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Great Western Resources Inc → Great Western Coal (Ky) Inc; 1990-06-01 to 1992-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Four Aces Mining Inc → Lcb #8; 1992-04-23 to 1993-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Darrell  Wagner → Four Aces Mining Inc; 1992-04-23 to 1993-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Crockett Collieries (Ky) Inc → Lcb #8; 1993-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Great Western Resources Inc → Crockett Collieries (Ky) Inc; 1993-08-11 to current/open; source msha-controller-operator-history