# Relationship history for MSHA mine 2104072

Current hierarchy: **Jeffrey D  Jorgenson → Jorgenson Backhoe & Construction, LLC → Spike Dam**

- 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:** Jeffrey D  Jorgenson et al → Spike Dam; 2014-09-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jorgenson Backhoe & Construction, LLC → Spike Dam; 2024-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey D  Jorgenson et al → Jorgenson Backhoe & Construction, LLC; 2024-05-19 to current/open; source msha-controller-operator-history