# Relationship history for MSHA mine 4300524

Current hierarchy: **Daniel A  Gurney; Douglas C  Gurney → GURNEY BROTHERS CONSTRUCTION INC → AUSTIN WESTERN CRUSHER**

- 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:** Gurney Brothers Construction Inc → AUSTIN WESTERN CRUSHER; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas C  Gurney  et al → AUSTIN WESTERN CRUSHER; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas C  Gurney  et al → Gurney Brothers Construction Inc; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel A  Gurney  et al → Gurney Brothers Construction Inc; 1999-07-01 to current/open; source msha-controller-operator-history