# Relationship history for MSHA mine 0203407

Current hierarchy: **Taiheiyo Cement Corp → CalPortland Company → Jackrabbit Aggregates**

- 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

- **controller_controls_mine:** Taiheiyo Cement Corp → Jackrabbit Aggregates; 1990-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Circle H West → Jackrabbit Aggregates; 2019-01-17 to 2022-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Ron  Harper  et al → Jackrabbit Aggregates; 2019-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Harper  et al → Circle H West; 2019-01-17 to 2022-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Harper  et al → Circle H West; 2019-01-17 to 2022-06-02; source msha-controller-operator-history
- **operator_operates_mine:** CalPortland Company → Jackrabbit Aggregates; 2022-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taiheiyo Cement Corp → CalPortland Company; 2022-06-03 to current/open; source msha-controller-operator-history