# Relationship history for MSHA mine 0405559

Current hierarchy: **Mac  A  Culver → Provista Mining Co. → Swiftshore Mine**

- 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:** Provista Mining Co. → Swiftshore Mine; 2003-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mac  A  Culver et al → Swiftshore Mine; 2003-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mac  A  Culver et al → Provista Mining Co.; 2003-05-28 to current/open; source msha-controller-operator-history