# Relationship history for MSHA mine 0404724

Current hierarchy: **Caleb  Holland → Sierra Cascade Aggregate & Asphalt Products, Inc. → North Chester 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** M & T Inc → North Chester Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Baldwin Contracting Company Inc → North Chester Pit; 1984-09-01 to 1999-02-08; source msha-controller-operator-history
- **controller_controls_operator:** M & T Inc → Baldwin Contracting Company Inc; 1984-09-01 to 1999-02-08; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → North Chester Pit; 1996-08-01 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Baldwin Contracting Company Inc → North Chester Pit; 1999-02-09 to 2008-05-14; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Baldwin Contracting Company Inc; 1999-02-09 to 2008-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Sierra Cascade Aggregate & Asphalt Products LLC → North Chester Pit; 2008-05-15 to 2017-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Caleb  Holland et al → North Chester Pit; 2008-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Caleb  Holland et al → Sierra Cascade Aggregate & Asphalt Products LLC; 2008-05-15 to 2017-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Deanna  Welch → Sierra Cascade Aggregate & Asphalt Products LLC; 2008-05-15 to 2017-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Caleb  Holland → North Chester Pit; 2016-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sierra Cascade Aggregate & Asphalt Products, Inc. → North Chester Pit; 2017-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Caleb  Holland → Sierra Cascade Aggregate & Asphalt Products, Inc.; 2017-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → North Chester Pit; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Baldwin Contracting Company Inc; 2023-06-01 to 2008-05-14; source msha-controller-operator-history