# Relationship history for MSHA mine 1800546

Current hierarchy: **Zappone Michael J → Zappone Construction Company → Barrellville Strip**

- 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:** Zappone Construction Company → Barrellville Strip; 1974-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Zappone Michael J → Barrellville Strip; 1974-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zappone Michael J → Zappone Construction Company; 1974-06-01 to current/open; source msha-controller-operator-history