# Relationship history for MSHA mine 4102344

Current hierarchy: **Sheldon Jack → Jack Sheldon Excavating & Trucking Company → Shelton Sand Pit**

- 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:** Jack Sheldon Excavating & Trucking Company → Shelton Sand Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sheldon Jack → Shelton Sand Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sheldon Jack → Jack Sheldon Excavating & Trucking Company; 1950-01-01 to current/open; source msha-controller-operator-history