# Relationship history for MSHA mine 3603220

Current hierarchy: **Laurence J  Silvi II; John L  Silvi → Sahara Sand Of Falls Inc → Sahara Sand Of Falls 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Sahara Sand Of Falls Inc → Sahara Sand Of Falls Incorporated; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Laurence J  Silvi II  Et Al → Sahara Sand Of Falls Incorporated; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laurence J  Silvi II  Et Al → Sahara Sand Of Falls Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John L  Silvi  Et Al → Sahara Sand Of Falls Inc; 1950-01-01 to current/open; source msha-controller-operator-history