# Relationship history for MSHA mine 3003324

Current hierarchy: **Michael D  Austin → AUSTIN SAND & GRAVEL → Sultana Sand & Stone Incorporated**

- 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:** Sultana Sand & Stone Inc → Sultana Sand & Stone Incorporated; 2000-04-01 to 2022-07-05; source msha-controller-operator-history
- **controller_controls_mine:** Kim K  Whetzel → Sultana Sand & Stone Incorporated; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kim K  Whetzel → Sultana Sand & Stone Inc; 2000-04-01 to 2022-07-05; source msha-controller-operator-history
- **controller_controls_mine:** Michael D  Austin → Sultana Sand & Stone Incorporated; 2014-10-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** AUSTIN SAND & GRAVEL → Sultana Sand & Stone Incorporated; 2022-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael D  Austin → AUSTIN SAND & GRAVEL; 2022-07-06 to current/open; source msha-controller-operator-history