# Relationship history for MSHA mine 2103679

Current hierarchy: **Harlan J.  Balgaard → Balgaard Services → Cedar Rapids Crusher**

- 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:** Balgaard Services → Cedar Rapids Crusher; 2009-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harlan J.  Balgaard → Cedar Rapids Crusher; 2009-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harlan J.  Balgaard → Balgaard Services; 2009-06-30 to current/open; source msha-controller-operator-history