# Relationship history for MSHA mine 4801833

Current hierarchy: **Daniel P  Dietzler → Western Proppants, LLC → Western Proppants Facility #1**

- 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

- **controller_controls_mine:** Daniel P  Dietzler → Western Proppants Facility #1; 2013-08-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Proppants, LLC → Western Proppants Facility #1; 2019-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel P  Dietzler → Western Proppants, LLC; 2019-11-06 to current/open; source msha-controller-operator-history