# Relationship history for MSHA mine 2002716

Current hierarchy: **Joel  Bieri; Dale  Bieri → O E Bieri & Sons Inc → CEDAR RAPIDS PLANT #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** O E Bieri & Sons Inc → CEDAR RAPIDS PLANT #1; 1984-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joel  Bieri  et al → CEDAR RAPIDS PLANT #1; 1984-06-01 to 2025-09-25; source msha-controller-operator-history
- **controller_controls_operator:** Joel  Bieri  et al → O E Bieri & Sons Inc; 1984-06-01 to 2025-09-25; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Bieri  et al → O E Bieri & Sons Inc; 1984-06-01 to 2025-09-25; source msha-controller-operator-history
- **controller_controls_mine:** Dale  Bieri et al → CEDAR RAPIDS PLANT #1; 2025-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dale  Bieri et al → O E Bieri & Sons Inc; 2025-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joel  Bieri et al → O E Bieri & Sons Inc; 2025-09-26 to current/open; source msha-controller-operator-history