# Relationship history for MSHA mine 0400034

Current hierarchy: **Taiheiyo Cement Corp → CalPortland Company → Redding Plant**

- 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:** Flintkote Cement Company → Redding Plant; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Flintkote Company → Redding Plant; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Flintkote Company → Flintkote Cement Company; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Calaveras Cement Company → Redding Plant; 1980-04-07 to 1999-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Cimenteries Cbr Cementbedrijven → Redding Plant; 1980-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cimenteries Cbr Cementbedrijven → Calaveras Cement Company; 1980-04-07 to 1999-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Taiheiyo Cement Corp → Redding Plant; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Redding Plant; 1999-05-12 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Redding Plant; 1999-05-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lehigh Southwest Cement Company → Redding Plant; 2000-01-01 to 2021-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Lehigh Southwest Cement Company; 2000-01-01 to 2021-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Lehigh Cement West LLC → Redding Plant; 2021-05-01 to 2022-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Lehigh Cement West LLC; 2021-05-01 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Redding Plant; 2021-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Lehigh Cement West LLC; 2021-10-01 to 2022-06-30; source msha-controller-operator-history
- **operator_operates_mine:** CalPortland Company → Redding Plant; 2022-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taiheiyo Cement Corp → CalPortland Company; 2022-07-01 to current/open; source msha-controller-operator-history