# Relationship history for MSHA mine 2100529

Current hierarchy: **Victoria  Kreger → Conteck Enterprises, Inc. → Cedarapids 6045**

- 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:** Hedberg & Sons Company → Cedarapids 6045; 1950-01-01 to 1990-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Fred W  Hedberg → Cedarapids 6045; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred W  Hedberg → Hedberg & Sons Company; 1950-01-01 to 1990-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Victoria  Kreger → Cedarapids 6045; 1987-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Conteck Enterprises, Inc. → Cedarapids 6045; 1990-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Victoria  Kreger → Conteck Enterprises, Inc.; 1990-10-25 to current/open; source msha-controller-operator-history