# Relationship history for MSHA mine 3003837

Current hierarchy: **Luis P  Antunes → J & A Sand & Gravel → J & A Mine #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** J & A Sand & Gravel → J & A Mine #1; 2012-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Luis P  Antunes → J & A Mine #1; 2012-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Luis P  Antunes → J & A Sand & Gravel; 2012-03-27 to current/open; source msha-controller-operator-history