# Relationship history for MSHA mine 3608594

Current hierarchy: **William C  Lombardo; Frank J  Lombardo → Lombardo Brothers Development Company Inc → Lombardo Operation**

- 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:** Robachele Inc → Lombardo Operation; 1996-08-01 to 1998-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Michele  Mattioli → Lombardo Operation; 1996-08-01 to 1998-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Michele  Mattioli → Robachele Inc; 1996-08-01 to 1998-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Lombardo Brothers Development Company Inc → Lombardo Operation; 1998-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William C  Lombardo et al → Lombardo Operation; 1998-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William C  Lombardo et al → Lombardo Brothers Development Company Inc; 1998-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank J  Lombardo et al → Lombardo Brothers Development Company Inc; 1998-09-17 to current/open; source msha-controller-operator-history