# Relationship history for MSHA mine 0403569

Current hierarchy: **Taiheiyo Cement Corp → CalPortland, Co. → Baxter Mine**

- 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:** California Portland Cement Company → Baxter Mine; 1950-01-01 to 1990-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Calmat Company → Baxter Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company → California Portland Cement Company; 1950-01-01 to 1990-09-30; source msha-controller-operator-history
- **operator_operates_mine:** California Portland Cement Company → Baxter Mine; 1990-10-01 to 1992-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Taiheiyo Cement Corp → Baxter Mine; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taiheiyo Cement Corp → California Portland Cement Company; 1990-10-01 to 1992-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Hahm International Inc → Baxter Mine; 1992-02-13 to 1999-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Scott R  Descher → Baxter Mine; 1992-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott R  Descher → Hahm International Inc; 1992-02-13 to 1999-06-30; source msha-controller-operator-history
- **operator_operates_mine:** California Portland Cement Company → Baxter Mine; 1999-07-01 to 2000-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Taiheiyo Cement Corp → California Portland Cement Company; 1999-07-01 to 2000-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Hahm International Inc → Baxter Mine; 2000-02-14 to 2014-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Scott R  Descher → Hahm International Inc; 2000-02-14 to 2014-08-24; source msha-controller-operator-history
- **operator_operates_mine:** CalPortland, Co. → Baxter Mine; 2014-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taiheiyo Cement Corp → CalPortland, Co.; 2014-08-25 to current/open; source msha-controller-operator-history