# Relationship history for MSHA mine 0202914

Current hierarchy: **David L  Giebink → Beaver Dam Excavating → BEAVER DAM EXCAVATING**

- 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:** Beaver Dam Excavating → BEAVER DAM EXCAVATING; 2001-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David L  Giebink → BEAVER DAM EXCAVATING; 2001-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David L  Giebink → Beaver Dam Excavating; 2001-01-01 to current/open; source msha-controller-operator-history