# Relationship history for MSHA mine 3608612

Current hierarchy: **William M  Ruark → Meshoppen Stone Inc → Furman Quarry**

- 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

- **controller_controls_mine:** William M  Ruark → Furman Quarry; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bradford Quarries Inc → Furman Quarry; 1997-03-01 to 2005-08-08; source msha-controller-operator-history
- **controller_controls_mine:** John  Heeman Jr → Furman Quarry; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Heeman Jr → Bradford Quarries Inc; 1997-03-01 to 2005-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Meshoppen Stone Inc → Furman Quarry; 2005-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William M  Ruark → Meshoppen Stone Inc; 2005-08-09 to current/open; source msha-controller-operator-history