# Relationship history for MSHA mine 3609969

Current hierarchy: **Andrew  Swank; Tim  Zeglin → Mountain Top Excavation LLC → Ostop-Schneider Borrow Site**

- 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:** Mountain Top Excavation LLC → Ostop-Schneider Borrow Site; 2011-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Zeglin et al → Ostop-Schneider Borrow Site; 2011-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Zeglin et al → Mountain Top Excavation LLC; 2011-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew  Swank et al → Mountain Top Excavation LLC; 2011-07-08 to current/open; source msha-controller-operator-history