# Relationship history for MSHA mine 2103632

Current hierarchy: **Kyle B  Hvezda; Deborah K  Hvezda → Hvezda Excavating → Hvezda Pit**

- 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:** Hvezda Excavating → Hvezda Pit; 2008-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Deborah K  Hvezda et al → Hvezda Pit; 2008-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deborah K  Hvezda et al → Hvezda Excavating; 2008-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kyle B  Hvezda et al → Hvezda Excavating; 2008-06-25 to current/open; source msha-controller-operator-history