# Relationship history for MSHA mine 3901608

Current hierarchy: **David  Alexander → Mitchell Quarry → Mitchell Quarry**

- 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:** Dakota Constructors Inc → Mitchell Quarry; 2015-03-10 to 2025-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Warren  Barse → Mitchell Quarry; 2015-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warren  Barse → Dakota Constructors Inc; 2015-03-10 to 2025-02-05; source msha-controller-operator-history
- **operator_operates_mine:** Mitchell Quarry → Mitchell Quarry; 2025-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Alexander → Mitchell Quarry; 2025-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Alexander → Mitchell Quarry; 2025-02-06 to current/open; source msha-controller-operator-history