# Relationship history for MSHA mine 2001512

Current hierarchy: **Eichenberg Randy → Eichenberg Excavating Inc → CEDAR RAPIDS #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Howard Eichenberg Excavating → CEDAR RAPIDS #1; 1989-08-01 to 1992-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Eichenberg Howard → CEDAR RAPIDS #1; 1989-08-01 to 1992-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Eichenberg Howard → Howard Eichenberg Excavating; 1989-08-01 to 1992-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Eichenberg Excavating Inc → CEDAR RAPIDS #1; 1992-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eichenberg Randy → CEDAR RAPIDS #1; 1992-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eichenberg Randy → Eichenberg Excavating Inc; 1992-09-21 to current/open; source msha-controller-operator-history