# Relationship history for MSHA mine 0203528

Current hierarchy: **Robert K  Sanders → LINCOLN CONSTRUCTORS → LINCOLN CONSTRUCTORS PLANT #1**

- 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:** Lincoln Constructors → LINCOLN CONSTRUCTORS PLANT #1; 2025-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert K  Sanders → LINCOLN CONSTRUCTORS PLANT #1; 2025-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert K  Sanders → Lincoln Constructors; 2025-06-13 to current/open; source msha-controller-operator-history