# Relationship history for MSHA mine 2602623

Current hierarchy: **Loren E  Hunewill → H E Hunewill Construction Co Inc → PwrScrn Turbo Chieftan SN6619189 1400 Tk**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Loren E  Hunewill  et al → PwrScrn Turbo Chieftan SN6619189 1400 Tk; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H E Hunewill Construction Co Inc → PwrScrn Turbo Chieftan SN6619189 1400 Tk; 2007-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Loren E  Hunewill  et al → H E Hunewill Construction Co Inc; 2007-09-11 to current/open; source msha-controller-operator-history