# Relationship history for MSHA mine 1401810

Current hierarchy: **Kent  King; Dan C King → Kings Construction Co Inc → Portable #1**

- 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:** Kings Construction Co Inc → Portable #1; 2020-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dan C King et al → Portable #1; 2020-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan C King et al → Kings Construction Co Inc; 2020-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kent  King et al → Kings Construction Co Inc; 2020-02-19 to current/open; source msha-controller-operator-history