# Relationship history for MSHA mine 3609585

Current hierarchy: **William M  Ruark → Meshoppen Stone, Inc → Winterdale II & Winterdale IV**

- 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:** William M  Ruark → Winterdale II & Winterdale IV; 1987-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert A  Coleman → Winterdale II & Winterdale IV; 1996-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Endless Mountain Stone Co → Winterdale II & Winterdale IV; 2008-01-28 to 2022-05-08; source msha-controller-operator-history
- **controller_controls_operator:** Robert A  Coleman → Endless Mountain Stone Co; 2008-01-28 to 2022-05-08; source msha-controller-operator-history
- **operator_operates_mine:** Meshoppen Stone, Inc → Winterdale II & Winterdale IV; 2022-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William M  Ruark → Meshoppen Stone, Inc; 2022-05-09 to current/open; source msha-controller-operator-history