# Relationship history for MSHA mine 4503010

Current hierarchy: **Donald  Taylor → Olson-Taylor Inc → Scar Face Quarry**

- 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:** Donald  Taylor → Scar Face Quarry; 1982-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Olson-Taylor Inc → Scar Face Quarry; 1983-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Taylor → Olson-Taylor Inc; 1983-08-01 to current/open; source msha-controller-operator-history