# Relationship history for MSHA mine 2402713

Current hierarchy: **Harold J Wyrick → WYRICK CONSTRUCTION → WYRICK CRUSHER**

- 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:** Wyrick Construction → WYRICK CRUSHER; 2017-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harold J Wyrick → WYRICK CRUSHER; 2017-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold J Wyrick → Wyrick Construction; 2017-04-18 to current/open; source msha-controller-operator-history