# Relationship history for MSHA mine 1519085

Current hierarchy: **Douglas W  Hayes → GCAS Corporation LLC → GCAS #1**

- 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:** GCAS Corporation LLC → GCAS #1; 2007-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas W  Hayes → GCAS #1; 2007-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas W  Hayes → GCAS Corporation LLC; 2007-03-01 to current/open; source msha-controller-operator-history