# Relationship history for MSHA mine 4703147

Current hierarchy: **Tim  Trapp → T & T Custom Crushing Inc → Portable #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:** T & T Custom Crushing Inc → Portable #1; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Trapp → Portable #1; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Trapp → T & T Custom Crushing Inc; 1998-06-01 to current/open; source msha-controller-operator-history