# Relationship history for MSHA mine 0504689

Current hierarchy: **Justin  Mc Carty; Chad  Hughes → Durango Gravel Inc → DURANGO GRAVEL INC.**

- 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:** Durango Gravel Inc → DURANGO GRAVEL INC.; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Justin  Mc Carty  et al → DURANGO GRAVEL INC.; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justin  Mc Carty  et al → Durango Gravel Inc; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad  Hughes  et al → Durango Gravel Inc; 2000-09-01 to current/open; source msha-controller-operator-history