# Relationship history for MSHA mine 2102756

Current hierarchy: **Bakken Carrol → Marshall Ready Mix Sand & Gravel → Marshall Ready Mix Sand & Gravel**

- 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

- **operator_operates_mine:** Kompelien Jensen Gravel Company → Marshall Ready Mix Sand & Gravel; 1980-03-01 to 1982-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Kompelien K P-Brian Jensen Et Al → Marshall Ready Mix Sand & Gravel; 1980-03-01 to 1982-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Kompelien K P-Brian Jensen Et Al → Kompelien Jensen Gravel Company; 1980-03-01 to 1982-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Moorse Sand & Gravel → Marshall Ready Mix Sand & Gravel; 1982-11-09 to 1990-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Moorse Lawrence H Et Al → Marshall Ready Mix Sand & Gravel; 1982-11-09 to 1990-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Moorse Lawrence H Et Al → Moorse Sand & Gravel; 1982-11-09 to 1990-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Marshall Ready Mix Sand & Gravel → Marshall Ready Mix Sand & Gravel; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bakken Carrol → Marshall Ready Mix Sand & Gravel; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bakken Carrol → Marshall Ready Mix Sand & Gravel; 1990-06-01 to current/open; source msha-controller-operator-history