# Relationship history for MSHA mine 1302443

Current hierarchy: **Manaco Corporation → Wendling Quarries, Inc. → Portable Wash Plant Dept. 471**

- 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:** Manaco Corporation → Portable Wash Plant Dept. 471; 1987-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wendling Quarries, Inc. → Portable Wash Plant Dept. 471; 2014-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Manaco Corporation → Wendling Quarries, Inc.; 2014-06-11 to current/open; source msha-controller-operator-history