# Relationship history for MSHA mine 2002717

Current hierarchy: **John R  Carr Jr → Carr Bros & Sons → ALLIS CHALMER PLANT #1**

- 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

- **operator_operates_mine:** Carr Bros & Sons → ALLIS CHALMER PLANT #1; 1984-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John R  Carr Jr  et al → ALLIS CHALMER PLANT #1; 1984-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Carr Jr  et al → Carr Bros & Sons; 1984-06-01 to current/open; source msha-controller-operator-history