# Relationship history for MSHA mine 1302521

Current hierarchy: **Brad  Schreier → SPI, Inc → Cinles Lake Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** SPI, Inc → Cinles Lake Gravel; 2026-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brad  Schreier → Cinles Lake Gravel; 2026-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Schreier → SPI, Inc; 2026-04-02 to current/open; source msha-controller-operator-history