# Relationship history for MSHA mine 3901456

Current hierarchy: **Harvey A  Ackerson; Butch F  Oseby → Dakota Earthworks Inc → Plant #2**

- 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:** Don  Jerke → Plant #2; 1999-08-01 to 2005-07-27; source msha-controller-operator-history
- **operator_operates_mine:** Dakota Earthworks Inc → Plant #2; 2001-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Jerke → Dakota Earthworks Inc; 2001-12-20 to 2005-07-27; source msha-controller-operator-history
- **controller_controls_mine:** Butch F  Oseby et al → Plant #2; 2005-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Butch F  Oseby et al → Dakota Earthworks Inc; 2005-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harvey A  Ackerson et al → Dakota Earthworks Inc; 2005-07-28 to current/open; source msha-controller-operator-history