# Relationship history for MSHA mine 2103755

Current hierarchy: **Donald O  Loken; Dallas D  Loken → Don Loken Drainage, Inc. → Portable - Pioneer Crusher**

- 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:** Donald O  Loken et al → Portable - Pioneer Crusher; 2007-04-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Don Loken Drainage, Inc. → Portable - Pioneer Crusher; 2012-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald O  Loken et al → Don Loken Drainage, Inc.; 2012-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dallas D  Loken et al → Don Loken Drainage, Inc.; 2012-04-18 to current/open; source msha-controller-operator-history