# Relationship history for MSHA mine 3600274

Current hierarchy: **Robert M  Weleski; Richard F  Weleski → Winfield Lime & Stone Co., Inc. → WINFIELD LIME & STONE MINE & MILL**

- 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

- **operator_operates_mine:** Winfield Lime & Stone Co., Inc. → WINFIELD LIME & STONE MINE & MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert M  Weleski et al → WINFIELD LIME & STONE MINE & MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert M  Weleski et al → Winfield Lime & Stone Co., Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard F  Weleski et al → Winfield Lime & Stone Co., Inc.; 1950-01-01 to current/open; source msha-controller-operator-history