# Relationship history for MSHA mine 2200516

Current hierarchy: **Hicks David C & Sandra → Jet Sands Inc → Jet Sands 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Technical Sands Inc → Jet Sands Incorporated; 1980-02-01 to 1983-08-23; source msha-controller-operator-history
- **controller_controls_mine:** Hurd R E Jr → Jet Sands Incorporated; 1980-02-01 to 1983-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Hurd R E Jr → Technical Sands Inc; 1980-02-01 to 1983-08-23; source msha-controller-operator-history
- **operator_operates_mine:** Jet Sands Inc → Jet Sands Incorporated; 1983-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hicks David C & Sandra → Jet Sands Incorporated; 1983-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hicks David C & Sandra → Jet Sands Inc; 1983-08-24 to current/open; source msha-controller-operator-history