# Relationship history for MSHA mine 2902347

Current hierarchy: **Randy  Boulden; Brent  Corbin → DDT Aggregate → DDT Aggregate**

- 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:** Curry County Caliche Company → DDT Aggregate; 2007-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randy  Boulden  et al → DDT Aggregate; 2007-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Boulden  et al → Curry County Caliche Company; 2007-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Corbin  et al → Curry County Caliche Company; 2007-07-31 to current/open; source msha-controller-operator-history