# Relationship history for MSHA mine 0505020

Current hierarchy: **Robert Patrick Dietzler; John Patrick Dietzler; Daniel Patrick Dietzler → Western Proppants, LLC → McCloskey S250 Portable**

- 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:** Dietzler Construction Corp → McCloskey S250 Portable; 2013-08-15 to 2026-06-18; source msha-controller-operator-history
- **controller_controls_mine:** Daniel P  Dietzler → McCloskey S250 Portable; 2013-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel P  Dietzler → Dietzler Construction Corp; 2013-08-15 to 2026-06-18; source msha-controller-operator-history
- **operator_operates_mine:** Western Proppants, LLC → McCloskey S250 Portable; 2026-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert Patrick Dietzler et al → McCloskey S250 Portable; 2026-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert Patrick Dietzler et al → Western Proppants, LLC; 2026-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John Patrick Dietzler et al → Western Proppants, LLC; 2026-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel Patrick Dietzler et al → Western Proppants, LLC; 2026-06-19 to current/open; source msha-controller-operator-history