# Relationship history for MSHA mine 3102150

Current hierarchy: **William Mike  Stanley → Mount Airy Sand & Gravel → MIKE STANLEY MINE**

- 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

- **operator_operates_mine:** Mount Airy Sand & Gravel → MIKE STANLEY MINE; 2000-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William Mike  Stanley → MIKE STANLEY MINE; 2000-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William Mike  Stanley → Mount Airy Sand & Gravel; 2000-06-01 to current/open; source msha-controller-operator-history