# Relationship history for MSHA mine 4503584

Current hierarchy: **Albert N  DeAtley; Brien N  DeAtley → Quality Rock Products, Inc → Waldrick Screen It**

- 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:** Brien N  DeAtley et al → Waldrick Screen It; 1999-06-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quality Rock Products, Inc → Waldrick Screen It; 2005-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brien N  DeAtley et al → Quality Rock Products, Inc; 2005-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert N  DeAtley et al → Quality Rock Products, Inc; 2005-07-25 to current/open; source msha-controller-operator-history