# Relationship history for MSHA mine 3901652

Current hierarchy: **Sara L  Schoenfelder; Grant T  Schoenfelder → G and S Dirt and Demo → Clayton Pit**

- 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:** G and S Dirt and Demo → Clayton Pit; 2020-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grant T  Schoenfelder et al → Clayton Pit; 2020-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grant T  Schoenfelder et al → G and S Dirt and Demo; 2020-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sara L  Schoenfelder et al → G and S Dirt and Demo; 2020-08-04 to current/open; source msha-controller-operator-history