# Relationship history for MSHA mine 4503490

Current hierarchy: **Pamp  Maiers → AAA Concrete, Inc. → Benton City Wash 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Pamp  Maiers → Benton City Wash Plant; 1984-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A J Crushing LLC → Benton City Wash Plant; 2001-08-01 to 2014-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Adam  Schatz → Benton City Wash Plant; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adam  Schatz → A J Crushing LLC; 2001-08-01 to 2014-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Pamp  Maiers → Benton City Wash Plant; 2007-03-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North Central Construction Inc. → Benton City Wash Plant; 2014-06-09 to 2017-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Pamp  Maiers → North Central Construction Inc.; 2014-06-09 to 2017-09-04; source msha-controller-operator-history
- **operator_operates_mine:** AAA Concrete, Inc. → Benton City Wash Plant; 2017-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pamp  Maiers → AAA Concrete, Inc.; 2017-09-05 to current/open; source msha-controller-operator-history