# Relationship history for MSHA mine 3901476

Current hierarchy: **Douglas A  Rupp → Dakota Road Builders Inc. → Dakota-CP7**

- 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

- **controller_controls_mine:** Douglas A  Rupp → Dakota-CP7; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dakota Road Builders Inc. → Dakota-CP7; 2002-08-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas A  Rupp → Dakota Road Builders Inc.; 2002-08-07 to current/open; source msha-controller-operator-history