# Relationship history for MSHA mine 4801677

Current hierarchy: **Mark D  Hettinger → Hettinger LLC → Nordberg 5-3440**

- 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

- **operator_operates_mine:** Eagle Excavation Inc → Nordberg 5-3440; 2005-06-27 to 2007-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Brad  Holyoak → Nordberg 5-3440; 2005-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Holyoak → Eagle Excavation Inc; 2005-06-27 to 2007-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Hettinger LLC → Nordberg 5-3440; 2007-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark D  Hettinger et al → Nordberg 5-3440; 2007-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark D  Hettinger et al → Hettinger LLC; 2007-04-01 to current/open; source msha-controller-operator-history