# Relationship history for MSHA mine 4703289

Current hierarchy: **Gregory A  Schoone → John J Schoone Construction Inc → Wash Plant**

- 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:** John J Schoone Construction Inc → Wash Plant; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John J  Schoone → Wash Plant; 2001-09-01 to 2017-08-08; source msha-controller-operator-history
- **controller_controls_operator:** John J  Schoone → John J Schoone Construction Inc; 2001-09-01 to 2017-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Gregory A  Schoone → Wash Plant; 2017-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gregory A  Schoone → John J Schoone Construction Inc; 2017-08-09 to current/open; source msha-controller-operator-history