# Relationship history for MSHA mine 2301765

Current hierarchy: **Benjamin J  Barrett → Barrett Materials Inc → Plant #3**

- 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:** William  Staggenborg → Plant #3; 1950-01-01 to 1981-08-30; source msha-controller-operator-history
- **operator_operates_mine:** Big Spring Quarries → Plant #3; 1979-01-01 to 1981-08-30; source msha-controller-operator-history
- **controller_controls_operator:** William  Staggenborg → Big Spring Quarries; 1979-01-01 to 1981-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Mertens Construction Company Inc → Plant #3; 1981-05-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mid-Missouri Limestone, Inc → Plant #3; 1981-08-31 to 2018-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Mertens Construction Company Inc → Mid-Missouri Limestone, Inc; 1981-08-31 to 2018-01-25; source msha-controller-operator-history
- **controller_controls_mine:** James L  Barrett → Plant #3; 1990-03-01 to 2024-11-09; source msha-controller-operator-history
- **controller_controls_mine:** Con-Agg Llc → Plant #3; 2001-12-28 to 2010-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Plant #3; 2010-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Con-Agg Companies, LLC → Plant #3; 2018-01-26 to 2020-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Con-Agg Llc → Con-Agg Companies, LLC; 2018-01-26 to 2010-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Con-Agg Companies, LLC; 2018-01-26 to 2020-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Barrett Materials Inc → Plant #3; 2020-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James L  Barrett → Barrett Materials Inc; 2020-03-31 to 2024-11-09; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin J  Barrett → Plant #3; 2024-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin J  Barrett → Barrett Materials Inc; 2024-11-10 to current/open; source msha-controller-operator-history