# Relationship history for MSHA mine 2100511

Current hierarchy: **Engel Elwood → Engel'S Truck Service Inc → Cedar Rapids #14644**

- 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

- **operator_operates_mine:** Fairway Construction Inc → Cedar Rapids #14644; 1950-01-01 to 1980-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Neil  Sing → Cedar Rapids #14644; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Neil  Sing → Fairway Construction Inc; 1950-01-01 to 1980-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Bauerly Brothers Inc → Cedar Rapids #14644; 1950-01-01 to 2001-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Engel Elwood → Cedar Rapids #14644; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bauerly Brothers Inc → Cedar Rapids #14644; 1980-07-15 to 1981-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Bauerly Brothers Inc → Bauerly Brothers Inc; 1980-07-15 to 1981-06-09; source msha-controller-operator-history
- **operator_operates_mine:** Engel'S Truck Service Inc → Cedar Rapids #14644; 1981-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Engel Elwood → Engel'S Truck Service Inc; 1981-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Cedar Rapids #14644; 2001-04-26 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Bauerly Brothers Inc; 2001-04-26 to 1981-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → Cedar Rapids #14644; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Bauerly Brothers Inc; 2023-06-01 to 1981-06-09; source msha-controller-operator-history