# Relationship history for MSHA mine 3503331

Current hierarchy: **Hercher Gary E → Gary E Hercher Crushing → Hercher Portable**

- 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:** Gary E Hercher Crushing → Hercher Portable; 1989-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hercher Gary E → Hercher Portable; 1989-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hercher Gary E → Gary E Hercher Crushing; 1989-02-01 to current/open; source msha-controller-operator-history