# Relationship history for MSHA mine 3609013

Current hierarchy: **Jeff  Castorina; William  Loch → A & B Flagstone Company → HALLOWICH**

- 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:** A & B Flagstone Company → HALLOWICH; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Loch  et al → HALLOWICH; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Loch  et al → A & B Flagstone Company; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Castorina  et al → A & B Flagstone Company; 2001-09-01 to current/open; source msha-controller-operator-history