# Relationship history for MSHA mine 2003622

Current hierarchy: **John R  Carr Jr → Carr Brothers and Sons, Inc. → TROMMEL SCREEN**

- 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 R  Carr Jr  et al → TROMMEL SCREEN; 1984-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carr Brothers and Sons, Inc. → TROMMEL SCREEN; 2021-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Carr Jr  et al → Carr Brothers and Sons, Inc.; 2021-09-22 to current/open; source msha-controller-operator-history