# Relationship history for MSHA mine 3200798

Current hierarchy: **Fran  Schoonover → Onyx Construction Incorporated → Onyx Portable 3**

- 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

- **controller_controls_mine:** Fran  Schoonover et al → Onyx Portable 3; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Onyx Construction Incorporated → Onyx Portable 3; 2001-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fran  Schoonover et al → Onyx Construction Incorporated; 2001-07-12 to current/open; source msha-controller-operator-history