# Relationship history for MSHA mine 0404947

Current hierarchy: **Vulcan Materials Company → Superior Ready Mix Concrete L P → La Posta Sand 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** J Brouwer Investments Inc Et Al → La Posta Sand Plant; 1979-09-01 to 2025-04-27; source msha-controller-operator-history
- **operator_operates_mine:** Superior Ready Mix Concrete L P → La Posta Sand Plant; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Brouwer Investments Inc Et Al → Superior Ready Mix Concrete L P; 1988-05-01 to 2025-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → La Posta Sand Plant; 2025-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Superior Ready Mix Concrete L P; 2025-04-28 to current/open; source msha-controller-operator-history