# Relationship history for MSHA mine 4105665

Current hierarchy: **Eagle Materials Inc & Heidelberger Zement Ag → Texas Lehigh Cement Company → Seguin Sand**

- 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

- **controller_controls_mine:** Eagle Materials Inc & Heidelberger Zement Ag → Seguin Sand; 1986-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Texas Lehigh Cement Company → Seguin Sand; 2023-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eagle Materials Inc & Heidelberger Zement Ag → Texas Lehigh Cement Company; 2023-02-08 to current/open; source msha-controller-operator-history