# Relationship history for MSHA mine 2003590

Current hierarchy: **Chris  Schepers → Callahan Supply LLC → Callahan Aggregate Supply LLC**

- 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:** Callahan Supply LLC → Callahan Aggregate Supply LLC; 2020-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chris  Schepers → Callahan Aggregate Supply LLC; 2020-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Schepers → Callahan Supply LLC; 2020-04-06 to current/open; source msha-controller-operator-history