# Relationship history for MSHA mine 4103602

Current hierarchy: **Emmit B  Schultz Jr → Triad Sand Corp → TRIAD SAND PITS**

- 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:** Triad Sand Corp → TRIAD SAND PITS; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Emmit B  Schultz Jr → TRIAD SAND PITS; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Emmit B  Schultz Jr → Triad Sand Corp; 1990-04-01 to current/open; source msha-controller-operator-history