# Relationship history for MSHA mine 4703185

Current hierarchy: **Paul T  Ayres → American Materials Corp → #4797 Rip Rap Plant**

- 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:** Paul T  Ayres → #4797 Rip Rap Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Materials Corp → #4797 Rip Rap Plant; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul T  Ayres → American Materials Corp; 1999-04-01 to current/open; source msha-controller-operator-history