# Relationship history for MSHA mine 4503546

Current hierarchy: **Frank J Motley → Pre-Mix Inc N.W. → LaCrosse Sand 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

- **operator_operates_mine:** Pre-Mix Inc N.W. → LaCrosse Sand Pit; 2003-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank J Motley → LaCrosse Sand Pit; 2003-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank J Motley → Pre-Mix Inc N.W.; 2003-06-24 to current/open; source msha-controller-operator-history