# Relationship history for MSHA mine 3608917

Current hierarchy: **David B  Salsman → Salsman Stone → WARNER 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

- **operator_operates_mine:** Salsman Stone → WARNER QUARRY; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David B  Salsman → WARNER QUARRY; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David B  Salsman → Salsman Stone; 2000-09-01 to current/open; source msha-controller-operator-history