# Relationship history for MSHA mine 1302509

Current hierarchy: **Patricia  Wirtjers → J W Ready Mix & Construction, Inc → Sanders Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Patricia  Wirtjers → Sanders Pit; 1984-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J W Ready Mix & Construction, Inc → Sanders Pit; 2021-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patricia  Wirtjers → J W Ready Mix & Construction, Inc; 2021-09-07 to current/open; source msha-controller-operator-history