# Relationship history for MSHA mine 4502974

Current hierarchy: **A & B Asphalt Inc → Country Gals Asphalt Inc → Zillah Pit**

- 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:** A & B Asphalt Inc → Zillah Pit; 1980-07-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Country Gals Asphalt Inc → Zillah Pit; 1982-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A & B Asphalt Inc → Country Gals Asphalt Inc; 1982-10-01 to current/open; source msha-controller-operator-history