# Relationship history for MSHA mine 2301910

Current hierarchy: **Don E  LaBrayere → Missouri Portable Stone Inc → Missouri Portable Stone Incorporated**

- 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:** Don E  LaBrayere → Missouri Portable Stone Incorporated; 1979-07-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Missouri Portable Stone Inc → Missouri Portable Stone Incorporated; 1984-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don E  LaBrayere → Missouri Portable Stone Inc; 1984-04-01 to current/open; source msha-controller-operator-history