# Relationship history for MSHA mine 2902499

Current hierarchy: **Frank J  Smith Jr → Versatile Construction Company → Versatile Crusher #2**

- 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

- **controller_controls_mine:** Frank J  Smith Jr → Versatile Crusher #2; 1993-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Versatile Construction Company → Versatile Crusher #2; 2018-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank J  Smith Jr → Versatile Construction Company; 2018-02-01 to current/open; source msha-controller-operator-history