# Relationship history for MSHA mine 1701181

Current hierarchy: **David A Lee → David Lee Construction → Greenhill 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** David Lee Construction → Greenhill Pit; 2026-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David A Lee → Greenhill Pit; 2026-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David A Lee → David Lee Construction; 2026-04-21 to current/open; source msha-controller-operator-history