# Relationship history for MSHA mine 0201848

Current hierarchy: **Schulte Joseph → Pantano Materials → Pantano Materials**

- 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:** Pantano Sand & Gravel → Pantano Materials; 1950-01-01 to 1981-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Pryde William A → Pantano Materials; 1950-01-01 to 1981-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Pryde William A → Pantano Sand & Gravel; 1950-01-01 to 1981-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Pantano Sand & Gravel → Pantano Materials; 1982-01-01 to 1987-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Snyder Donald E → Pantano Materials; 1982-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Snyder Donald E → Pantano Sand & Gravel; 1982-01-01 to 1987-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Pantano Materials → Pantano Materials; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Schulte Joseph → Pantano Materials; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schulte Joseph → Pantano Materials; 1988-01-01 to current/open; source msha-controller-operator-history