# Relationship history for MSHA mine 0103348

Current hierarchy: **WPR Holding Inc → W P R Materials, Inc → Excel 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:** W P R Materials, Inc → Excel Pit; 2006-07-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** WPR Holding Inc → Excel Pit; 2006-07-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** WPR Holding Inc → W P R Materials, Inc; 2006-07-05 to current/open; source msha-controller-operator-history