# Relationship history for MSHA mine 0203299

Current hierarchy: **UNACEM Corp S A A → Drake Materials → Drake Iron Ore**

- 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

- **controller_controls_mine:** John N  Stoss et al → Drake Iron Ore; 2005-01-31 to 2007-07-08; source msha-controller-operator-history
- **controller_controls_mine:** ARPL Tecnolgia Industrial S A → Drake Iron Ore; 2007-07-09 to 2013-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Drake Materials → Drake Iron Ore; 2012-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John N  Stoss et al → Drake Materials; 2012-04-13 to 2007-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Joel D  Schneyer et al → Drake Materials; 2012-04-13 to 2007-07-08; source msha-controller-operator-history
- **controller_controls_operator:** ARPL Tecnolgia Industrial S A → Drake Materials; 2012-04-13 to 2013-04-14; source msha-controller-operator-history
- **controller_controls_mine:** UNACEM Corp S A A → Drake Iron Ore; 2013-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** UNACEM Corp S A A → Drake Materials; 2013-04-15 to current/open; source msha-controller-operator-history