# Relationship history for MSHA mine 4100787

Current hierarchy: **Cemex S A → Gulf Coast Portland Cement Company → Gulf Coast 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:** Gulf Coast Portland Cement Company → Gulf Coast Plant; 1950-01-01 to 1983-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Mc Donough Company → Gulf Coast Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Donough Company → Gulf Coast Portland Cement Company; 1950-01-01 to 1983-05-30; source msha-controller-operator-history
- **operator_operates_mine:** Gulf Coast Portland Cement Company → Gulf Coast Plant; 1983-05-31 to 1990-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Marmac Corp → Gulf Coast Plant; 1983-05-31 to 1990-05-21; source msha-controller-operator-history
- **controller_controls_operator:** Marmac Corp → Gulf Coast Portland Cement Company; 1983-05-31 to 1990-05-21; source msha-controller-operator-history
- **operator_operates_mine:** Gulf Coast Portland Cement Company → Gulf Coast Plant; 1990-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Gulf Coast Plant; 1990-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Gulf Coast Portland Cement Company; 1990-05-22 to current/open; source msha-controller-operator-history