# Relationship history for MSHA mine 0203427

Current hierarchy: **UNACEM Corp S A A → Sunshine Concrete & Materials → Drake Mobile Crusher**

- 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:** Joel D  Schneyer et al → Drake Mobile Crusher; 2005-01-31 to 2007-07-08; source msha-controller-operator-history
- **controller_controls_mine:** ARPL Tecnolgia Industrial S A → Drake Mobile Crusher; 2007-07-09 to 2013-04-14; source msha-controller-operator-history
- **controller_controls_mine:** UNACEM Corp S A A → Drake Mobile Crusher; 2013-04-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sunshine Concrete & Materials → Drake Mobile Crusher; 2020-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joel D  Schneyer et al → Sunshine Concrete & Materials; 2020-02-24 to 2007-07-08; source msha-controller-operator-history
- **controller_controls_operator:** John N  Stoss et al → Sunshine Concrete & Materials; 2020-02-24 to 2007-07-08; source msha-controller-operator-history
- **controller_controls_operator:** ARPL Tecnolgia Industrial S A → Sunshine Concrete & Materials; 2020-02-24 to 2013-04-14; source msha-controller-operator-history
- **controller_controls_operator:** UNACEM Corp S A A → Sunshine Concrete & Materials; 2020-02-24 to current/open; source msha-controller-operator-history