# Relationship history for MSHA mine 2602387

Current hierarchy: **Linda  Mills → Button Point Sand & Gravel → BUTTON POINT SAND & GRAVEL**

- 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

- **operator_operates_mine:** Button Point Sand & Gravel → BUTTON POINT SAND & GRAVEL; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Linda  Mills → BUTTON POINT SAND & GRAVEL; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Linda  Mills → Button Point Sand & Gravel; 1999-06-01 to current/open; source msha-controller-operator-history