# Relationship history for MSHA mine 3609822

Current hierarchy: **Roburt C  Whittemore → Whittemore Quarries → Whittemore Quarries II**

- 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:** Roburt C  Whittemore → Whittemore Quarries II; 2009-07-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Whittemore Quarries → Whittemore Quarries II; 2010-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roburt C  Whittemore → Whittemore Quarries; 2010-01-26 to current/open; source msha-controller-operator-history