# Relationship history for MSHA mine 1102743

Current hierarchy: **Jerry  Henry → Mid-West Sand & Gravel Inc → Mitzelfelt 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

- **controller_controls_mine:** Jerry  Henry → Mitzelfelt Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mid-West Sand & Gravel Inc → Mitzelfelt Pit; 1980-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Henry → Mid-West Sand & Gravel Inc; 1980-05-01 to current/open; source msha-controller-operator-history