# Relationship history for MSHA mine 1300017

Current hierarchy: **Steven R  Powell → Lee Crawford Quarry Company → LEE CRAWFORD QY CO**

- 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:** Lee Crawford Quarry Company → LEE CRAWFORD QY CO; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steven R  Powell → LEE CRAWFORD QY CO; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven R  Powell → Lee Crawford Quarry Company; 1950-01-01 to current/open; source msha-controller-operator-history