# Relationship history for MSHA mine 0202901

Current hierarchy: **Shirley J  Hammond → Hammond Wholesale Flagstone Inc → HAMMOND STONE MTN 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:** Shirley J  Hammond → HAMMOND STONE MTN QUARRY; 1999-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hammond Wholesale Flagstone Inc → HAMMOND STONE MTN QUARRY; 2000-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shirley J  Hammond → Hammond Wholesale Flagstone Inc; 2000-08-01 to current/open; source msha-controller-operator-history