# Relationship history for MSHA mine 2402721

Current hierarchy: **Melvin D  Smith → Melvin D Smith → Excavating Etc**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Melvin D Smith → Excavating Etc; 2017-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Melvin D  Smith → Excavating Etc; 2017-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Melvin D  Smith → Melvin D Smith; 2017-10-16 to current/open; source msha-controller-operator-history